Autosave and Save Crash

I have a survival map I've been playing since the launch of bedrock edition on the Switch. In terms of map, I've filled a map for the middle area on a 3x3 lvl 4 map wall, and there i have a whole castle built right in the center. I recently built a base to the east map of a lvl 4 map, right in the center. Even built a rail all the way to there and started building. I noticed that after yesterday, the game would freeze upon traveling the rail in a minecart and would freeze every so often, usually around the autosave time. The map fluctuates between 94.2 mb and 104.4 mb during every save depending on where I am in the world.

But last night, it crashes during an autosave. And now every time I load the map it loads up, but when the autosave time comes, it crashes, and starts me right back where I was upon bootup. Dying seemed to have spawned me in a different place, but the issue still happens when the autosave finishes. It never actually autosaves i guess.

Even saving and quitting crashes the game. On each crash it says "The software was closed because an error occured." Then I have to reboot the whole game. It only happens on this one world. I did a corrupted file search, no corrupted file was found. I archived the game and re-download it. Nothing seems to work.

What is the issue and how do I resolve this