I play on my Laptop on the Java Edition with my friends.

Recently I've bought back my realm, but recently when playing survival with my friends i noticed the next day when we came back a lot of our progress would be lost, about 30 minutes or more of work, which is quite a lot for a survival, mainly when you're building. I tried closing and opening the realm but it didn't resolve the issue and this seems to be happening every night when we leave and join back the next day. We lose progress in mining, building, as if we went back in the save.

Also, some of the other players seem to have strong connectivity issues where they disconnect suddenly or join and disconnect, but this is the least of the issues.

We don't play with mods, texture packs or behavior pack. The world is a survival world with cheats enabled and the issue, for now, does not appear to happen in my creative world. 

Thank you so much for your attention and help! 

PS: It appears the glitch of not saving happens the most after we change worlds.