Minecraft on Nintendo Switch keeps crashing.

Hello. This problem is very old and anyways it keeps happening. Right now I can play Minecraft but without my worlds (I had to delete them and save them in the NS online Service). If I download my data, the game crashes on the beggining screen. In the past, it crashed when I wanted to join ANY world or when I was leaving one. It was temporaly fixed, but I keep having this problem. Thanks.