If you have all 3 xbows being upgraded simultaneously, and then tap on the town hall, the game will crash. Once one of my xbows was finished, the problem went away. In case level makes a difference, they were all level 3 upgrading to level 4.
There are workarounds for the lost functionality, but it's kind of annoying.
Tested on a Samsung Galaxy S6 and a Samsung Note 3.
Edit: I suspect it has to do with the logic that determines whether the xbow reload button shows up when you tap the TH, but I don't exactly have access to the client source code so I can't really check.




