Entirely random after phone's been off – Moves Review

Used to have minor accuracy issue after the phone had run out of power, but now Moves may randomly show, say 40 miles walked on a day I walked less than three and long periods of "Moves off" when it wasn't. Yesterday it registered only 7 minutes of walking, but still declared that 17 miles — 145mph is neither "walking" nor realistic. Bringing it in the foreground will eventually resolve it, but that's worryingly attention craving. I have given it full location access, motion&fitness, mobile data and background refresh. Giving a Facebook-owned app that kind of access is quite concerning on its own.
Review by grandgeezer on Moves.