I haven't been able to track down what is causing this as nothing appears in the logs, but I believe Chromimum and chromimum-based (or electron) based software behaves the same way. It appears if I don't start up chromium within the first few minutes or so of my computer being on, it will crash my graphics and my screen goes black. The OS itself doesn't crash because it reboots. I have this same behavior with editors/vscode.
Nvidia GTX 1070Ti
Driver version x11/nvidia-driver-440.82
FreeBSD 12.1-STABLE r361840
KDE Plasma 5.18.5
Rendering Backend setting in Plasma: OpenGL 2.0
At times if it Doesn't crash, it loads really slow and looks like it's about to crash. My xorg file.conf file is generated by nvidia-xconfig
I'm running with nvidia too, desktop is kde plasma latest in ports.
FreeBSD ayo 12.1-RELEASE-p6 FreeBSD 12.1-RELEASE-p6 GENERIC amd64
Since I updated to the latest 83.0.4103.61, if I start Chromium then the system goes wonky. Clicking on anything does nothing, no response. The only thing that works is alt-tab to get to konsole terminal that is already running and I can type. It also "pastes" random weird text from other windows. (like the list of servers in the hexchat program that is running. just appears.). I don't have any more details yet, and not 100% it's Chromium's fault but it only seems to go wonky after i start Chromium.)