I'm not sure if this is related to the firmware or the app (seems more app related)....But I had an issue yesterday (after upgrading and flying for the first time) where the app lost signal, I didn't lose control of the aircraft, the app didn't crash but just experienced a loss of signal (video cut out and displayed "signal disconnect" app was still open though) I've never had this happen prior to upgrading which led me to think it could be fw related, only had it happen once out of the 4 batteries that I ran through it and only lasted 10-15seconds maybe.
Again, could've just been a fluke thing..but thought I would share