I've been playing on a realm with my two brothers, our little cousin and my girlfriend for a couple of weeks now. Since yesterday the game started to corrupt very frequently, which always returned me to the same backup, where I was exploring in the Nether. I come back to my house and not so long after roaming by my base the game says it got corrupt. I reload the backup save I had and the same thing keeps happening: shortly after leaving the nether, putting my stuff in my chests and leaving to explore the overworld, whether it is to find villages, new biomes or to mine nearby, the game corrupts after 20, 30 minutes. I always come back to that same point where I'm about to leave the Nether, on the same save.
My realms world has less than 70 MB. It doesn't look heavy to me. We all play on our iPhones and had no previous problems to that. I don't think Internet connection is our problem, since I've tried both with wi-fi and my own phone's 4G, which is a fairly decent as well. With both connections I've experienced the same problem.
I don't know what to do... please help us!
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Does the same issue happen in a local copy of the world?
If so, can you provide a list of steps to reproduce the corruption along with a "pre-corruption" copy of the world for testing? Since the world is too large to attach to the bug tracker, it would need to be uploaded to a file-sharing site and you can add a comment to the main ticket with the link and steps.
My steps prior to corruption were either one of those 4:
1) quit Nether safely, organize my belongings, enchant a diamond pickaxe with Fortune III and keep it in a chest, mount on my horse and ride it to explore the North of my village. The game corrupted as I rode my horse.
2) quit Nether safely, organize my belongings and leave to search for diamonds in my mine. The game corrupted as I was running on some hills between my base in the mine.
3) quit Nether safely, organize my belongings and leave to build a watchtower to the North of my base. The game corrupted as I was doing some earthmoving on a slope to begin placing cobblestone.
4) explore the Nether and find a Bastion Remnant, gather some of its treasures and return safely to the overworld. Upon arriving in my base, I organised my belongings in chests and went to sleep. The game corrupted as I woke up after a decent night's rest.
If I recall correctly, most, if not all of my save corruptions happened shortly or some time after returning to the overworld.
About the playing the same game on a local copy: I've tested it a few times. Although I normally experience a weird corruption seconds upon playing this local copy for the first time, once I enter the game for the second time, after this first corruption message, everything flows smoothly and i don't seem to experience any problems afterwards.
As for the "pre-corruption" copy of the world for test, I'm not sure if this will work, and I'm really sorry if it don't. I took it from my phone and transfered to my computer, but I don't have bedrock edition on my PC to verify if this is it. I'll welcome any orientation because I really want to help you solve this problem!
See if this link leads you to the "pre-corruption" copy: it should start with me on the Nether, having 40 units of cooked beef and a few diamond tools and weapons at hand:
https://drive.google.com/file/d/1K8Z5XvWDXGUs1lNsfHUEFdrmyeTQAmhW/view?usp=sharing
As I said, I'm totally eager to help. Let me know if this link doesn't work or if you need any additional information.