I have the same sort of issue...  Ubuntu 20.04 (Ubuntu Studio spin).

>From Xorg.0.log
[ 13886.780] (EE) client bug: timer event4 debounce short: scheduled expiry is 
in the past (-9ms), your system is too slow
[ 13926.080] (EE) client bug: timer event4 debounce: scheduled expiry is in the 
past (-15ms), your system is too slow

Video freezes, external display will go black or the system will crash
(I expect it is only X that crashes because if I am editing audio in
Audacity, the audio will continue to play, yet I will have to hard reset
my machine to regain control.  Keyboard and mouse input are dead as part
of X system.  I have not tried remoting in to it from another machine
yet.

Running a MacBook Pro retina mid 2012 with 8GB RAM and the i7 processor
with GeForce GT 650M Mac Edition graphics chip at 4K@30Hz output.  If I
have the system running powersave, I get the hard crashes, with ondemand
governor I get the timeouts.  Going to performance causes the fans to
run all the time which is loud.

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https://bugs.launchpad.net/bugs/1870597

Title:
  libinput says: scheduled expiry is in the past... your system is too
  slow

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