I went ahead and applied the nvme_core.default_ps_max_latency_us=0
kernel parameter to grub default yesterday (Based on this issue reported
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1678184)

However, I just ran into the freeze again. System was unattended for a
while and I see the login screen with all the icons blanked out.

sudo nvme id-ctrl /dev/nvme0
NVME Identify Controller:
vid       : 0x15b7
ssvid     : 0x15b7
sn        : 205135806243        
mn        : WDC PC SN530 SDBPMPZ-512G-1101          
fr        : 21160001
rab       : 4
ieee      : 001b44
cmic      : 0
mdts      : 7
cntlid    : 0x1
ver       : 0x10400
rtd3r     : 0x7a120
rtd3e     : 0xf4240
oaes      : 0x200
ctratt    : 0x2
rrls      : 0
cntrltype : 1
fguid     : 
crdt1     : 0
crdt2     : 0
crdt3     : 0
oacs      : 0x17
acl       : 4
aerl      : 7
frmw      : 0x14
lpa       : 0x1e
elpe      : 255
npss      : 4
avscc     : 0x1
apsta     : 0x1
wctemp    : 353
cctemp    : 358
mtfa      : 50
hmpre     : 51200
hmmin     : 823
tnvmcap   : 512110190592
unvmcap   : 0
rpmbs     : 0
edstt     : 57
dsto      : 1
fwug      : 1
kas       : 0
hctma     : 0x1
mntmt     : 273
mxtmt     : 358
sanicap   : 0x60000002
hmminds   : 0
hmmaxd    : 8
nsetidmax : 0
endgidmax : 0
anatt     : 0
anacap    : 0
anagrpmax : 0
nanagrpid : 0
pels      : 1
sqes      : 0x66
cqes      : 0x44
maxcmd    : 0
nn        : 1
oncs      : 0x5f
fuses     : 0
fna       : 0
vwc       : 0x7
awun      : 0
awupf     : 0
nvscc     : 1
nwpc      : 0
acwu      : 0
sgls      : 0
mnan      : 0
subnqn    : nqn.2018-01.com.wdc:guid:E8238FA6BF53-0001-001B448B484DAFF7
ioccsz    : 0
iorcsz    : 0
icdoff    : 0
ctrattr   : 0
msdbd     : 0
ps    0 : mp:3.50W operational enlat:0 exlat:0 rrt:0 rrl:0
          rwt:0 rwl:0 idle_power:0.6300W active_power:2.10W
ps    1 : mp:2.40W operational enlat:0 exlat:0 rrt:0 rrl:0
          rwt:0 rwl:0 idle_power:0.6300W active_power:1.60W
ps    2 : mp:1.90W operational enlat:0 exlat:0 rrt:0 rrl:0
          rwt:0 rwl:0 idle_power:0.6300W active_power:1.50W
ps    3 : mp:0.0250W non-operational enlat:3900 exlat:11000 rrt:3 rrl:3
          rwt:3 rwl:3 idle_power:0.0250W active_power:-
ps    4 : mp:0.0050W non-operational enlat:5000 exlat:39000 rrt:4 rrl:4
          rwt:4 rwl:4 idle_power:0.0050W active_power:-

===========================================
===========================================

sudo nvme get-feature -f 0x0c -H /dev/nvme0n1
get-feature:0xc (Autonomous Power State Transition), Current value:00000000
        Autonomous Power State Transition Enable (APSTE): Disabled
        Auto PST Entries        .................
        Entry[ 0]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[ 1]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[ 2]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[ 3]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[ 4]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[ 5]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[ 6]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[ 7]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[ 8]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[ 9]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[10]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[11]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[12]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[13]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[14]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[15]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[16]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[17]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[18]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[19]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[20]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[21]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[22]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[23]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[24]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[25]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[26]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[27]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[28]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[29]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[30]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................
        Entry[31]   
        .................
        Idle Time Prior to Transition (ITPT): 0 ms
        Idle Transition Power State   (ITPS): 0
        .................

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https://bugs.launchpad.net/bugs/1927866

Title:
  Root filesystem becomes readonly frequenty freezing system

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