Whenever I save and exit it starts to save but when it gets to "Loading Resources"  it freezes and then crashes. I have lowered my settings to see if that would hep, it didn't. When it crashes I lose the progress that wasn't saved by autosave. It also only appears to happen when I have played on the world for 15 - 60+ minutes.

Steps to replicate:

Go onto Minecraft on Nintendo Switch

Go into any world

Leave the game running for 15 to 60 minutes

Save and leave

When it gets to Loading Resources on the progess bar it freezes and then a few seconds later, it crashes.

In 1.14.1 it seems to crash a lot less but it still crashes sometimes.