Hi,
I have try with the new linux-image-5.4.0-3-amd64 (I have see in the
changelog that this version introduce various i915 modification).
The bug is present also in this version.
Probably it is less frequent (need more time to pop up).
It seem that I have the system freeze only if I use a particular web
application for 3-4 hours (probably, as workaround, I can try to close
the browser each hour and restart it). In a normal browser use
(navigation) I never had a system freeze.
I will wait the 5.5 to see if it will fix this bug.
Ciao
Davide