During gameplay, the software completely crashes every hour or so and the standard Switch error message is shown. I have noticed that the crashes usually occur during an autosave.
There is a similar bug report (MCPE-45862), but that one is marked as resolved and there are still several people in the comments saying that they are still experiencing the issue.
One difference between that issue and this one is that the person that wrote it was unable to access their world after several crashes, but I can still load mine just fine.
Additional details:
- The world I use is a survival world created in version 1.11.0 (the game could crash in other worlds, but this is the only one I play on)
- I am using some resource packs, but the crashes still happenned just as often before I started using them.
- I am not using any behavior packs.
- I have tried checking for corrupt data within the Switch's settings (which returned as a negative) and redownloading the game but that did not change anything.
- I was able to upload the world to a realm, and then download it and play it on the Windows 10 edition; will test if the crash occurs on that later this week when I have time.
- This is not an issue related to online gameplay as I always play with offline singleplayer.
Edit- Tested the same world on Windows 10 Edition overnight, did not crash at all.
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Exactly the same thing is happening to me for getting on 2 months now. Its really annoying in survival, that and mobs despawning an random items despawning as well. I also lose stuffin my inventory or it just doesnt craft but takes the ingredients needed...

Still crashing here constantly as well. Tried testing if it was just handheld which is what I always play in but it's not. Takes slightly longer in docked mode but still doesn't last more than a couple hours.
Several things tend to happen when it crashes too. First is that I'm set back to the last auto save, but for some reason, everything in the world is saved so several times I've done something stupid, got killed, crashed just after getting killed and re-opened to find myself 2- 5 minutes before being killed but with everything on me AND where I died on the ground. Duping everything I had on me.
Also, mobs, animals, villagers - named or not - will often disappear. Had a mending guy named "The Mender" segregated and was zombifying him to reduce the cost from 20 but he disappeared during a crash yesterday. There was no way in or out of the building except double fence gates (since I found out Iron Doors don't stop zombies anymore and disappear instead of being dropped for some reason) so he wasn't going anywhere of his own accord nor could anything get in.
Turtles in particular are terrible at sticking around. Several times I've got a brood of them going and all of them disappear with a crash, even named like the villager was. And they're just in a glass roofed pen on the beach nearby with a hole in the top to feed them/get in and out so they have even less possibility of escape than the villager did at zero. EDIT: Forgot to mention none of them were eggs or babies (nor is it near a forest even if they were, all trees are planted by me) when I walked away either. So nothing made them go away. Especially since I have a ~300 x 400 area around them lit up. Even if something would come and kill them, they can't spawn close enough and the beach edge itself is slabbed to prevent Drowned from coming on land.
Not using any texture packs or skin packs (don't even have them installed because I don't deal with MTX) so that's not it. Online or offline doesn't matter.
And honestly, I'm getting pretty fed up with this now. Autosave turning off is the obvious fix here. Even if only temporary until the actual problem is found. I've read people saying preventing duping or save scumming etc. is an excuse but if true, it's demonstrably a terrible reason when the crashing from autosave is CAUSING duping. It doesn't even happen every time but I already have a double chest dedicated to housing the extras.
I don't even fear using up my top notch Infinity Bow at this point. I've got three of the exact same Bow near full durability in a chest, 2 from crashes in the last week alone.

I never thought the disapearing of mobs/villagers could be due to the crashes, but now you have said it I think that is what is happening. I had 4 crashes yesterday during 2 hours of game pkay and thats when all my villagers and penned animals disapeared. I have also noticed that when I was dismantling my villager hall today because it is now empty, I had a crash. When I reloaded I spawned in a place where I would of been halfway through breaking my lecturns and they were all gone, which I had removed them all prior to the crash. So this would be the same as what you are talking about after a crash and reloading.
I too am fed up now. My world is a 1.11 created achievement world. Its hard enough doibg a raw survival without keep encountering these issues. Resources gathered are hard earned and precious.

1.12.1 came out recently, it says it fixes crashes, will report on this later.
Edit: It still crashes in 1.12.1
If you have a copy of the world available, you might like to upload a copy of it for investigation.
On Windows 10 you can use the Export world feature.
On Android or iOS you need to use a file explorer to navigate to Device storage > games > com.mojang > minecraftWorlds
On Xbox or Switch the only way is to upload it to a Realm, and then download the world on Windows 10 or Android/iOS. (Please do not purchase a Realms subscription just to provide a world to us - but if you have a Realm already this may be a viable option if you wish to do so.)
If the world is larger than 10MB you can upload the world to OneDrive or a similar file sharing site, and then share the link.

Same issue. Microsoft login doesn’t always pop up.
Also noticed that after purchasing a skin that despite a successful login the game doesn’t show that login.

@unknown Are you sure you're on the right thread?

Thank you for your report!
Crashes such as these are logged automatically, and will be looked into further by the development team.
If you need help or support you might like to follow a link below.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
I agree, the crashing hasn't been fixed, the game always crashes after a certain amount of time.
Edit: Yes, it does always happen during autosave. Of course, it's always autosave causing the problems!