Bad behavior of game emulators - crashes, reboots etc

I decided to use my V4K+ for retro gaming too and I am experiencing very bad stuff. Almost all NES emulators are very unstable, let me post a list

nes/bnes - starting any game results in sad face - (launched around 20:25)
nes/nestopia - black screen all the time (except when I open “pause” menu, then game picture is visible on background but goes to black once i exit the menu) - (around 20:34)
nes/quicknes - sad face after few seconds of gaming - (around 20:36)

the only usable emulator is fceumm right now which is quite not okay, because its probably the slowest among them

not sure if i do something wrong, does anyone have better luck with vero4k+ and gaming??