https://bugzilla.kernel.org/show_bug.cgi?id=205089
--- Comment #10 from Bruno Jacquet (maxijac@free.fr) --- With a more recent stack it seems I am no longer experiencing this. Kernel 5.4.35 and mesa 20.0.5 seems stable for me.
Andreas, did you try upgrading your SW components and see if you still have the issue?