FWIW, I'm experiencing very similar symptoms on the same kernel 
(5.3.0-46-generic), but on different hardware: This is a Lenovo ThinkPad E490. 
One thing that makes it *much* more frequent is running jackd with realtime 
priority. Running with ardour and jack, during the freezes audio proceeds 
normally (even MIDI events and synths work fine), but keyboard, mouse and 
monitor freeze. This occurs about once a minute!
I've also experienced longer crashes (gave up and rebooted after a minute) when 
performing skype calls or just watching youtube, but those are far less 
frequent.

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https://bugs.launchpad.net/bugs/1872001

Title:
  5.3.0-46-generic - i915 - frequent GPU hangs  / resets rcs0

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