Arrival time updates without a zone change

[Airblader]

Hi there! Thanks for this amazing integration.

I noticed that when I am home, sometimes the arrival_time will randomly update, even though I haven't changed zones. Looking at the event log, it seems that the mobile app zone disappears momentarily, but the IC3 zone does not. However, I have zone notifications enabled in my HA iOS app, and get no notification that a zone was exited or entered.

Is there anything I can do to keep this accurate, or debug further?