Since the patch i have had some really random crashes (only similarity i have seen so far is it happens while i am mining). I have noticed that when the game crashes I can't use other apps, they just crash at start up, like pandora (music streaming app). I would like to post my crash logs but it looks like i have 25 logs just from playing today.
I have started just rebooting my phone every time the game hangs. Also, I have taken to only playing for a few hundred crystals before quitting the game to make sure my progress saves.
I have also had many crashes during mining, almost always when replenishing the field. I think it might have something to do with having two 'special' blocks appearing in such a way that they would set each other off (like one right on top of another). To test, I played very slowly, getting rid of any 'special' blocks immediately as they came up. That was 30 or so minutes of mining with no crashes. (~2500 blocks)
I was then able to engineer a crash by placing one 'special' block over another that was coming up but wasn't yet active. As soon as the new row was due to activate, AF crashed. (88 blocks)
I have crashed many, many times today but have not been able to detect any pattern. Personally I have had two special blocks activated at the same time with no issue, but have had it freeze when just exploding three normal blocks...frustrating...but this game is worth it.