When I return home the buildings I have upgrading appear to be destroyed (as if during an attack) and their health bars appear to go up and down and battle noises repeat until I exit the game and come back. I'm on an Asus tablet running android 4.4.2
Hey! This sounds like a new one to me. You should contact support through the in game settings. It will send an email to support@rovio.com with your device and account details. And it will let you explain your problem to them.
Oooh, that's a new one. As Bear said, if you could send a ticket in-game via the Log->Settings->Help->Support, we'll be able to get your exact details and have a look at what's going on.
