The potential common cause points toward the GPU drivers (note of games in Proton, libgtk4 segfaults, and libnvidia-glcore segfaults). What nvidia driver version is in use. A quick search found a rough match to shown symptoms, but is recent and matches the hardware (NVidia Polaris desktop). Perhaps the driver version in use exhibits a similar showing of a regression for such GPUs?
In my case, AT&T sent me a Galaxy Note 9 to replace my Google Pixel XL, which I ended up never using and just used as trade-in value to get a Pixel 5a.