System currently has 16GB RAM, graphics card 2GB (GTX1050). So i guess you ment GPU memory right?
then with frequent channel switching, you will run out of memory
I could reproduce it with a small "power-zapping script", after 80-100 channel switches with softhddevice VDR aborts. But with softhdcuvid it was not reproduceable, VDR survives even the 600 switches of the script.
btw. mpv shows the above behaviour playing UHD videos.
I tested plugin with VDPAU but sadly i have problems with laggy playback and desktop (post1319846), thats why i switched to CUVID where i do not have no such problems.