Surround becomes unstable with latest drivers

My setup is: 6 4k monitors, of which I use three to make a surround, while leaving remaining 3 as “regular” monitors.
Recently I noticed frequent driver crashes with firefox, factorio, some other games.
What should I do? How can I help developers to fix this problem?

Also I heard that surround as a technology is pretty much abandoned and nvidia uses mosaic now. How to use mosaic? Because I see no such option in nvidia control panel.