I also have these dropouts lately. It happens when playing back the recording. I have noticed that I have to reset the date settings but that does not prevent the dropouts.
I have found out that when starting the playing I immediatly after a few seconds remove the uTrack progam from the active memory of the iPhone 6 with the latest upgrade. After removing the program from meory I have no problems with dropouts whatsoever.
At the end of the song it stops automatically.
I think it has to do with the latest software upgrade of Apple.
I hope this helps you guys.