I learned a valuable lesson yesterday. I'd ridden out 12 miles, turned around, and was headed back when I stopped to have a snack. When I took the phone from the trunk bag it was in "airplane mode" which kills just about everything. Son of a @#$%&
! I thought my phone was going wacky until it dawned on me. I had put my phone face down with a squishy snack bar under the top end of the phone. I'm thinking that the soft snack bar, deformed by the warmth of the bag, was touching the screen sending random commands to the phone itself even though it was supposed to be locked. There went my Strava track for the day.
I won't make that mistake again. Now I'll slip it into the belt holster which prevents anything from touching the screen. That should take care of the problem.