Crashes again

It has started crashing again, it used to crash after a few minutes but now it crashes after five to ten minutes (which is even more frustrating because I’ve gotten into a rhythm and then I crashes and I loose good progress). It’s wasn’t crashing for a little while then it starting crashing. I was able to stop it for a little while because I deleted Minecraft and re-downloaded it. I would like to not have to do that again and loose good worlds.

love the game though <3<3<3