I appear to be having a very similar issue which started for me in
December of 2019.  I am running Ubuntu 19.10 and my system will no
longer come out of suspend correctly.  It hangs and kern.log shows the
following:

Jan 14 08:30:04 tank-7530 kernel: [   94.776836] pci 0000:04:01.0:   bridge 
window [mem 0x84100000-0x9b1fffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776842] pci 0000:04:01.0:   bridge 
window [mem 0x4000100000-0x40250fffff 64bit pref]
Jan 14 08:30:04 tank-7530 kernel: [   94.776852] pci 0000:3a:00.0: BAR 0: 
assigned [mem 0x9b200000-0x9b20ffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776860] pci 0000:04:02.0: PCI bridge 
to [bus 3a]
Jan 14 08:30:04 tank-7530 kernel: [   94.776867] pci 0000:04:02.0:   bridge 
window [mem 0x9b200000-0x9b2fffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776873] pci 0000:04:02.0:   bridge 
window [mem 0x4025100000-0x40251fffff 64bit pref]
Jan 14 08:30:04 tank-7530 kernel: [   94.776882] pci 0000:04:04.0: PCI bridge 
to [bus 3b-6d]
Jan 14 08:30:04 tank-7530 kernel: [   94.776889] pci 0000:04:04.0:   bridge 
window [mem 0x9b300000-0xb20fffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776894] pci 0000:04:04.0:   bridge 
window [mem 0x4025200000-0x4049ffffff 64bit pref]
Jan 14 08:30:04 tank-7530 kernel: [   94.776904] pci 0000:03:00.0: PCI bridge 
to [bus 04-6d]
Jan 14 08:30:04 tank-7530 kernel: [   94.776911] pci 0000:03:00.0:   bridge 
window [mem 0x84000000-0xb20fffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776916] pci 0000:03:00.0:   bridge 
window [mem 0x4000000000-0x4049ffffff 64bit pref]
Jan 14 08:30:04 tank-7530 kernel: [   94.776926] pcieport 0000:00:1c.0: PCI 
bridge to [bus 03-6d]
Jan 14 08:30:04 tank-7530 kernel: [   94.776929] pcieport 0000:00:1c.0:   
bridge window [io  0x5000-0x5fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776935] pcieport 0000:00:1c.0:   
bridge window [mem 0x84000000-0xb20fffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776939] pcieport 0000:00:1c.0:   
bridge window [mem 0x4000000000-0x4049ffffff 64bit pref]
Jan 14 08:30:04 tank-7530 kernel: [   94.776946] PCI: No. 2 try to assign 
unassigned res
Jan 14 08:30:04 tank-7530 kernel: [   94.776950] pcieport 0000:00:1c.0: 
resource 13 [io  0x5000-0x5fff] released
Jan 14 08:30:04 tank-7530 kernel: [   94.776951] pcieport 0000:00:1c.0: PCI 
bridge to [bus 03-6d]
Jan 14 08:30:04 tank-7530 kernel: [   94.776964] pcieport 0000:00:1c.0: BAR 13: 
assigned [io  0x5000-0x8fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776966] pci 0000:03:00.0: BAR 13: 
assigned [io  0x5000-0x8fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776968] pci 0000:04:00.0: BAR 13: 
assigned [io  0x5000-0x5fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776969] pci 0000:04:01.0: BAR 13: 
assigned [io  0x6000-0x6fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776970] pci 0000:04:02.0: BAR 13: 
assigned [io  0x7000-0x7fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776971] pci 0000:04:04.0: BAR 13: 
assigned [io  0x8000-0x8fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776973] pci 0000:04:00.0: PCI bridge 
to [bus 05]
Jan 14 08:30:04 tank-7530 kernel: [   94.776979] pci 0000:04:00.0:   bridge 
window [io  0x5000-0x5fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776986] pci 0000:04:00.0:   bridge 
window [mem 0x84000000-0x840fffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.776991] pci 0000:04:00.0:   bridge 
window [mem 0x4000000000-0x40000fffff 64bit pref]
Jan 14 08:30:04 tank-7530 kernel: [   94.776999] pci 0000:04:01.0: PCI bridge 
to [bus 06-39]
Jan 14 08:30:04 tank-7530 kernel: [   94.777002] pci 0000:04:01.0:   bridge 
window [io  0x6000-0x6fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.777009] pci 0000:04:01.0:   bridge 
window [mem 0x84100000-0x9b1fffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.777013] pci 0000:04:01.0:   bridge 
window [mem 0x4000100000-0x40250fffff 64bit pref]
Jan 14 08:30:04 tank-7530 kernel: [   94.777022] pci 0000:04:02.0: PCI bridge 
to [bus 3a]
Jan 14 08:30:04 tank-7530 kernel: [   94.777025] pci 0000:04:02.0:   bridge 
window [io  0x7000-0x7fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.777031] pci 0000:04:02.0:   bridge 
window [mem 0x9b200000-0x9b2fffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.777036] pci 0000:04:02.0:   bridge 
window [mem 0x4025100000-0x40251fffff 64bit pref]
Jan 14 08:30:04 tank-7530 kernel: [   94.777045] pci 0000:04:04.0: PCI bridge 
to [bus 3b-6d]
Jan 14 08:30:04 tank-7530 kernel: [   94.777047] pci 0000:04:04.0:   bridge 
window [io  0x8000-0x8fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.777054] pci 0000:04:04.0:   bridge 
window [mem 0x9b300000-0xb20fffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.777059] pci 0000:04:04.0:   bridge 
window [mem 0x4025200000-0x4049ffffff 64bit pref]
Jan 14 08:30:04 tank-7530 kernel: [   94.777068] pci 0000:03:00.0: PCI bridge 
to [bus 04-6d]
Jan 14 08:30:04 tank-7530 kernel: [   94.777071] pci 0000:03:00.0:   bridge 
window [io  0x5000-0x8fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.777078] pci 0000:03:00.0:   bridge 
window [mem 0x84000000-0xb20fffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.777084] pci 0000:03:00.0:   bridge 
window [mem 0x4000000000-0x4049ffffff 64bit pref]
Jan 14 08:30:04 tank-7530 kernel: [   94.777091] pcieport 0000:00:1c.0: PCI 
bridge to [bus 03-6d]
Jan 14 08:30:04 tank-7530 kernel: [   94.777094] pcieport 0000:00:1c.0:   
bridge window [io  0x5000-0x8fff]
Jan 14 08:30:04 tank-7530 kernel: [   94.777099] pcieport 0000:00:1c.0:   
bridge window [mem 0x84000000-0xb20fffff]
Jan 14 08:30:04 tank-7530 kernel: [   94.777103] pcieport 0000:00:1c.0:   
bridge window [mem 0x4000000000-0x4049ffffff 64bit pref]
Jan 14 08:30:04 tank-7530 kernel: [   94.777143] pcieport 0000:03:00.0: 
enabling device (0000 -> 0003)
Jan 14 08:30:04 tank-7530 kernel: [   94.777399] pcieport 0000:04:00.0: 
enabling device (0000 -> 0003)
Jan 14 08:30:04 tank-7530 kernel: [   94.777699] pcieport 0000:04:01.0: 
enabling device (0000 -> 0003)
Jan 14 08:30:04 tank-7530 kernel: [   94.777882] pcieport 0000:04:01.0: pciehp: 
Slot #1 AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+ Interlock- 
NoCompl+ LLActRep+
Jan 14 08:30:04 tank-7530 kernel: [   94.778206] pcieport 0000:04:02.0: 
enabling device (0000 -> 0003)
Jan 14 08:30:04 tank-7530 kernel: [   94.778470] pcieport 0000:04:04.0: 
enabling device (0000 -> 0003)
Jan 14 08:30:04 tank-7530 kernel: [   94.778624] pcieport 0000:04:04.0: pciehp: 
Slot #4 AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+ Interlock- 
NoCompl+ LLActRep+
Jan 14 08:30:04 tank-7530 kernel: [   94.779025] pci 0000:3a:00.0: enabling 
device (0000 -> 0002)
Jan 14 08:30:04 tank-7530 kernel: [   94.779301] xhci_hcd 0000:3a:00.0: xHCI 
Host Controller
Jan 14 08:30:04 tank-7530 kernel: [   94.779305] xhci_hcd 0000:3a:00.0: new USB 
bus registered, assigned bus number 3
Jan 14 08:30:04 tank-7530 kernel: [   94.780553] xhci_hcd 0000:3a:00.0: hcc 
params 0x200077c1 hci version 0x110 quirks 0x0000000200009810
Jan 14 08:30:04 tank-7530 kernel: [   94.780835] usb usb3: New USB device 
found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.03
Jan 14 08:30:04 tank-7530 kernel: [   94.780836] usb usb3: New USB device 
strings: Mfr=3, Product=2, SerialNumber=1
Jan 14 08:30:04 tank-7530 kernel: [   94.780838] usb usb3: Product: xHCI Host 
Controller
Jan 14 08:30:04 tank-7530 kernel: [   94.780839] usb usb3: Manufacturer: Linux 
5.3.0-26-generic xhci-hcd
Jan 14 08:30:04 tank-7530 kernel: [   94.780840] usb usb3: SerialNumber: 
0000:3a:00.0
Jan 14 08:30:04 tank-7530 kernel: [   94.780971] hub 3-0:1.0: USB hub found
Jan 14 08:30:04 tank-7530 kernel: [   94.780985] hub 3-0:1.0: 2 ports detected
Jan 14 08:30:04 tank-7530 kernel: [   94.781653] xhci_hcd 0000:3a:00.0: xHCI 
Host Controller
Jan 14 08:30:04 tank-7530 kernel: [   94.781656] xhci_hcd 0000:3a:00.0: new USB 
bus registered, assigned bus number 4
Jan 14 08:30:04 tank-7530 kernel: [   94.781659] xhci_hcd 0000:3a:00.0: Host 
supports USB 3.1 Enhanced SuperSpeed
Jan 14 08:30:04 tank-7530 kernel: [   94.781706] usb usb4: New USB device 
found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.03
Jan 14 08:30:04 tank-7530 kernel: [   94.781708] usb usb4: New USB device 
strings: Mfr=3, Product=2, SerialNumber=1
Jan 14 08:30:04 tank-7530 kernel: [   94.781709] usb usb4: Product: xHCI Host 
Controller
Jan 14 08:30:04 tank-7530 kernel: [   94.781710] usb usb4: Manufacturer: Linux 
5.3.0-26-generic xhci-hcd
Jan 14 08:30:04 tank-7530 kernel: [   94.781712] usb usb4: SerialNumber: 
0000:3a:00.0
Jan 14 08:30:04 tank-7530 kernel: [   94.781750] thunderbolt 0000:05:00.0: 
enabling device (0000 -> 0002)
Jan 14 08:30:04 tank-7530 kernel: [   94.781817] hub 4-0:1.0: USB hub found
Jan 14 08:30:04 tank-7530 kernel: [   94.781833] hub 4-0:1.0: 2 ports detected
Jan 14 08:30:05 tank-7530 kernel: [   96.029450] pcieport 0000:00:1c.0: PCI 
bridge to [bus 03-6d]
Jan 14 08:30:05 tank-7530 kernel: [   96.029453] pcieport 0000:00:1c.0:   
bridge window [io  0x5000-0x8fff]
Jan 14 08:30:05 tank-7530 kernel: [   96.029459] pcieport 0000:00:1c.0:   
bridge window [mem 0x84000000-0xb20fffff]
Jan 14 08:30:05 tank-7530 kernel: [   96.029463] pcieport 0000:00:1c.0:   
bridge window [mem 0x4000000000-0x4049ffffff 64bit pref]
Jan 14 08:30:45 tank-7530 kernel: [  136.035961] pcieport 0000:00:1c.0: pciehp: 
Slot(4): Link Down
Jan 14 08:30:45 tank-7530 kernel: [  136.035962] pcieport 0000:00:1c.0: pciehp: 
Slot(4): Card not present
Jan 14 08:30:45 tank-7530 kernel: [  136.035988] pcieport 0000:04:04.0: Refused 
to change power state, currently in D3
Jan 14 08:30:45 tank-7530 kernel: [  136.036646] xhci_hcd 0000:3a:00.0: remove, 
state 1
Jan 14 08:30:45 tank-7530 kernel: [  136.036649] usb usb4: USB disconnect, 
device number 1
Jan 14 08:30:45 tank-7530 kernel: [  136.036873] xhci_hcd 0000:3a:00.0: USB bus 
4 deregistered
Jan 14 08:30:45 tank-7530 kernel: [  136.036886] xhci_hcd 0000:3a:00.0: xHCI 
host controller not responding, assume dead
Jan 14 08:30:45 tank-7530 kernel: [  136.036889] xhci_hcd 0000:3a:00.0: remove, 
state 1
Jan 14 08:30:45 tank-7530 kernel: [  136.036891] usb usb3: USB disconnect, 
device number 1
Jan 14 08:30:45 tank-7530 kernel: [  136.037060] xhci_hcd 0000:3a:00.0: Host 
halt failed, -19
Jan 14 08:30:45 tank-7530 kernel: [  136.037062] xhci_hcd 0000:3a:00.0: Host 
not accessible, reset failed.
Jan 14 08:30:45 tank-7530 kernel: [  136.037162] xhci_hcd 0000:3a:00.0: USB bus 
3 deregistered
Jan 14 08:30:45 tank-7530 kernel: [  136.037843] pcieport 0000:04:01.0: Refused 
to change power state, currently in D3
Jan 14 08:30:46 tank-7530 kernel: [  136.538922] pci_bus 0000:05: busn_res: 
[bus 05] is released
Jan 14 08:30:46 tank-7530 kernel: [  136.539000] pci_bus 0000:06: busn_res: 
[bus 06-39] is released
Jan 14 08:30:46 tank-7530 kernel: [  136.552191] pci_bus 0000:3a: busn_res: 
[bus 3a] is released
Jan 14 08:30:46 tank-7530 kernel: [  136.552255] pci_bus 0000:3b: busn_res: 
[bus 3b-6d] is released
Jan 14 08:30:46 tank-7530 kernel: [  136.552291] pci_bus 0000:04: busn_res: 
[bus 04-6d] is released

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Title:
  ThunderBolt "flaps" on laptop with 32G RAM

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