Screen glitching

I've been trying to find another forum that answers this but couldn't.

Anyways, I have Musescore on Chromebook through Linux. When I first downloaded it last year I had a couple of issues with crashing but they eventually went away. Now, every time I start working on my scores I run the risk that anything I click on or any button I press could cause the screen to glitch. Sometimes the screen goes partially white and sometimes black with glitched lines. It usually goes away once I move my cursor or stop whatever I am doing, but I am extremely concerned with what's going on. It also causes my cursor to lag or its FPS drops.

Let me know if anyone has any information or advice.