ABT fails to load with no reason

I've been playing for a while now, have all the new characters; arcee, arachnid, bluestreak & prowl all upgraded to level 7. The game has been playing fine except once in a while it seems to lose sync with the touch screen. Nothing restarting the app wouldn't fix. I played earlier today with no problems, started all my missions and cleared any available levels. Nothing seemed any different than any other day. Then tonight, I went to open the app, the screen goes black for a second, then I'm returned to the home screen. I backed up the app & cleared the data & cache. ABT Loaded up then, but I was started back over at the very beginning, unacceptable... I restored the backup and back to failure to load. Any advice would be super helpful. I have an old backup, but it's like 8 months old, I'd rather not lose that much progress...
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