That's interesting. What device/OS? My Android setup has been rock solid. The only bad thing I can say is that my battery consumption goes way up while running the app. I just make sure to charge my phone fully before a gig.
It also seems like having bluetooth connected drains the A10 battery way faster than I'm used to with the M10, which can sit turned on but idle in a drawer for weeks with no noticeable loss of charge.
And I've had no trouble setting levels with the iPhone app, either. MakersMarc, are you not getting the controls to change gain, or is nothing happening when you click on them?