Android 5.0 Lollipop and ABT – BAD COMBO!
Okay, if you can hold off on upgrading your phone to Android 5.0, do so. I've got a Samsung Galaxy S5 that just got the upgrade. ABT freezes in the middle of missions for as long as 8 minutes. It will eventually start going again, but you might miss it and get schwacked by a tower or a few missiles. I've reported it to Rovio (who I'm sure is being inundated with trouble calls on their games with this update), but I just have to wait.