Crashes every 5-10 minutes, tried everything to fix.

I made a brand new survival world, and I played on it for at least 15 minutes. I got off to do something, and then Minecraft crashed on the save screen.

EDIT: Now it’s gotten worse, it crashes every 5-10 minutes. I’m just trying to enjoy playing on one of my favourite games with my little sister. It annoys me SO much I can’t describe. I’ve even nicknamed the game ‘MineCRASH’ because that’s all it does. I know that Mojang records these crashes automatically, but wouldn’t it have been fixed already? It’s been almost a month since all of this started.

Anyways, sorry that this bug report is mostly me complaining, but Minecraft has always been one of my favourites. I just want to play it normally without so many crashes.
PLEASE fix this,
Allison Stoughton