I had a similar issue, low frequency or crashes after gaming for a while, turns out the fan control wasn’t setting the fan correctly and the GPU was overheating. Utilisation didn’t show it, but frequency did.
Restarting the game could be giving it enough time to cool off?
It definitely has its roots in Debian, but when you need to use that weird closed source application for work, if it has a “supported” (for a given value of support) Linux distro it’ll be Ubuntu.
I personally prefer straight Debian myself, or something entirely different but when asked for a recommendation by friends it’s Ubuntu.