Thanks for the quick reply, Harry. What about the times where I pull the phone out, it is displaying fine (as in the phone didn't go to the lock screen), but it says I've been on the same lap for the last 20 minutes? Is it missing the trigger points? Does changing phone orientation cause calibration...

Have had inconsistent success with the LapTimer for the last 3 track days now. This is at 2 tracks: Sonoma/Infineon and at Thunderhill. It will record some sessions and it won't record others. It will sometimes start to record the first lap, then it'll still be timing that lap for the next 20 minute...