Screen flickering issue.

[Cas_Gem]

Screen is flickering. Happens decently often if there's a lot of memory being used. Once it happens, it stays for a while despite restarts and shutdowns, then goes away by itself. Its accompanied by graphical glitches. The glitches can vary from videos becoming a left-to-right scroll slideshows, to discord displaying the left bar on the right and the top elements on the bottom. It sometimes fades to back. Does anyone know how to fix this?

[LamestWebsite]

Hello there,

I'm wondering if the Integrated GPU and External GPU arent fighting at some points, i've also had artefacts 
Try using only Nvdia GPU, go to Nvidia Control panel and chose NVidia card instead of autodetection,
overall try to ask for nvidia only