I was playing with friends and using the companion app, which we find very helpful, so thanks!
One issue we were having was, the host would press the "get started" button too soon, and didn't want to start the timer yet. So he'd hit "back," and we'd lose the pairings altogether. He did this twice! I guess the get-started button is too alluring. Maybe an "are you sure you want to start the timer?" pop up would fix this. Or saving the pairings somehow.
Sorry I don't have any info on what kind of phone he was using.