Villagers, Minecarts, and Animals disappearing randomly.

Villagers, Minecarts, and Animals keep just disappearing. Have put plenty time in maxing them out. It happens consistently. Have literally been disassembling the base and trying to downsize it so that it stops happening. Still continues to happen. Also the Realm continually crashes and each time you log in more things are missing. There is usually 3-5 people on at one time and the realm will just crash out. I don't know if this is Mojangs issue or Microsoft's servers are crap