INFO: task gnome-shell:5523 blocked for more than 120 seconds

[Chris]

I've noticed that my system will suddenly seem to 'lock-up'. I'd be
unable to switch windows and even the clock would freeze. I looked at
yesterday's kern.log.1 and saw this - https://paste.ubuntu.com/p/FC6fJv
nG35/ Kernel info is:

uname -a
Linux localhost 4.13.0-37-generic #42~16.04.1-Ubuntu SMP Wed Mar 7
16:03:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

I've found several instances of this via Google searches however none
really show a fix that I can see. 

-- 
Chris
KeyID 0xE372A7DA98E6705C
31.11972; -97.90167 (Elev. 1092 ft)
08:28:51 up 7 days, 9 min, 1 user, load average: 0.47, 0.66, 0.66
Description:	Ubuntu 16.04.4 LTS, kernel 4.13.0-37-generic
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