I have also found that on my phone Avenza doesn’t record points if I switch to another app even if the screen stays on the whole time. When I bring the screen back to Avenza the track jumps to the current location but nothing has been recorded during the time I had another app on the screen. I hope this helps you figure out what is going on and what I can do to fix it. Avenza Map is such an awesome tool, but this glitch makes it very hard to use on my phone. I have heard from another team member who has the same problem with a Pixel 3 running Android 10.