Same issue here, different (yet to be discovered) cause/trigger. Crashes quite frequently. Updated to 5.5 and v566.14 nvidia drivers (also have a 4090) and only thereafter experienced this issue. For me, simply opening a widget blueprint and leaving the event graph open for a time (several minutes) causes it. Switched back to 5.4 and thus far no issues…
UPDATE: after posting that I remembered I installed the Studio Driver and not the Game Ready Driver, so I did a clean install of that driver and have used 5.5 without issue for several hours since!