Game suddenly closes with no error

For the last 4-5 days, my game has been suddenly closing with no error. Just poof I see my desktop. This does not happen at any particular time, and it seems to be happening with increasing frequency (7 times today?). It has happened:

* Standing in hideout tabbed out
* Running around in wildwood
* Looting in a map
* Looking at my gear while standing next to delve cart
* Chatting in hideout
* Running a strand map

I have noticed 2 instances (out of like 20) where it had coincidental timing with something else:

* Once it happened right as I opened the atlas passive tree
* Once it happened at the same time as the twitch player encountered an error

I have tried changing video settings (Vulkan to DX12, turning settings down). I have tried monitoring memory/CPU usage (doesn't seem to be anything notable).