For 8-10 weeks we have seen significant issues with the reliability of alarms in the Android Dexcom Follow App.
I use a modern Android phone (Moto X4). I have had numerous instances at night, the primary time when I use alarms, when I have had no alarms ringing on data loss. I have been the witness, during the day, of muffled alarms failing on the very first ring: the ring starts and immediately stops.
For instance, last night I should have been woken up by a data loss alarm every 30 minutes, using the Alarm Clock Long alarm sound, a very long and loud alarm. Yet I was instantly woken up at 6:40 by a very feeble timer alarm app.
As I mentioned earlier, I have heard, in day time, while awake, a regular Alarm Clock Long alarm muffle out and die on the very first ring. I have seen directly how it can fail. I suspect that, for some reason, the data loss alarm fails more.
This is, of course, quite disturbing. I have now decided to restart my phone every night just in case it solves the issue. But I am concerned.
FYI, my Dexcom app gives me, as all my phones have for about a year, a periodic screen saying that the app has never been tested on my actual phone model.
As note, I only use long and loud Dexcom alarms.