On our way to Aero Expo on Sunday, heading SE and just south (10 miles approx) of the Isle of Man, the Skydemon aircraft symbol stopped, turned red (it was yellow) and pointed north. A message to the effect Route ended (or lost or closed, can't quite remember) and another stated that it had stopped logging. I turned Skydemon off and back on - didn't help, I then turned the IPad off and back on again but still no luck. About 10 minutes later it started working again and did so without incident for the remaining 5 hours of flying that day .