@Cmac4.6 This might be your problem; it was for me: https://github.com/ValveSoftware/steam-for-linux/issues/11446

Update: Good news for BI devs -- I've discovered that this lagbomb may not be Bohemia issue, but a Valve issue (affecting Linux only). It's reported on Valve's bug tracker. https://github.com/ValveSoftware/steam-for-linux/issues/11446

Confirmed that this is happening for me, as well as other users on the Steam forums. It's the same symptoms -- after playing for around an hour the game becomes very laggy. VRAM and RAM are stable, so I guess it's not a memory leak (even though it behaves like one). I do get the crash window after I alt-F4 out of the game. I've been submitting them but I'm putting it here too so that everyone can see it's not just them getting the issue.

Same issue here. I didn't used to get this issue until maybe release 1.2 or 1.3? For me I don't directly crash out; rather my game just goes very laggy. It's not a memory leak as far as I can tell; neither VRAM or regular memory are doing anything unusual. But it behaves like a memory leak -- I get half an hour of play time and then the game all of a sudden becomes unplayably laggy. When I close the game I'm left with a crash report box like the one below.

Thanks Geez, holding down the radio allowed me to finish the tutorial, as you instructed. However, no message played for me over the radio; it was silent. Must be an issue with the audio file on my system or something.

I've got a very similar issue; not sure if it's the same one. This issue only appeared for me after the last update. I'm on Fedora 36, running Proton 7.0-4 (issue persists with Experimental as well).
Video of the issue attached below.