I too am having this problem after a suspend/resume [deep].

Kubuntu 18.04 (nearly up to date patches (20200424)


[285163.220315] Bluetooth: hci0: command 0xfc05 tx timeout
[285163.220316] Bluetooth: hci0: Reading Intel version information failed (-110)

To restart the BT adapter a simple:-

rmmod btusb
rmmod btintel
modprobe btinel
modprobe btusb

is sufficient for me.

I hope this helps.

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  Bluetooth unavailable after updates - Reading Intel version
  information failed (-110)

Status in linux package in Ubuntu:

Bug description:
  After 10 days of uptime with automatic updates, I rebooted. Bluetooth,
  which I use every day, is no longer available.

  $ dmesg | grep -i bluetooth
  [    4.846072] Bluetooth: Core ver 2.22
  [    4.846088] Bluetooth: HCI device and connection manager initialized
  [    4.846092] Bluetooth: HCI socket layer initialized
  [    4.846094] Bluetooth: L2CAP socket layer initialized
  [    4.846096] Bluetooth: SCO socket layer initialized
  [    5.434081] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
  [    5.434082] Bluetooth: BNEP filters: protocol multicast
  [    5.434086] Bluetooth: BNEP socket layer initialized
  [    6.874125] Bluetooth: hci0: command 0xfc05 tx timeout
  [    6.874129] Bluetooth: hci0: Reading Intel version information failed 

  $ uname -a
  Linux abu 5.3.2-050302-generic #201910010731 SMP Tue Oct 1 07:33:48 UTC 2019 
x86_64 x86_64 x86_64 GNU/Linux

  AMD Ryzen 5 3400G (Picasso, Raven Ridge) (Asrock A300) Ubuntu 18.04

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