Been dealing with inane Libre II sensor issues for a few years now. Latest has been, "Signal Loss Alarm", and prompt to scan the sensor non-sense. Scanning the sensor stops the alarms for about five to ten minutes, and then the pest returns. It had been occurring intermittently for about three months. Nothing seemed to mitigate the recurrence. Then a week back Android pushed out a security update, followed by a new OS release. The Libre II phone app had a melt down. Last night the &#*! phone was alerting me every 15 minutes with a signal loss alarm.
After reading this thread, I tried shutting the phone down and restarting. No joy. The "Signal Loss Alarms" kept coming. Reread the messages here and noted it was necessary to close out the app before restarting. So closed the app and restarted. Again, no joy. The alarms resumed and the Red Bang (red colored exclamation point nest to the three horizontal bars in the upper left of the app screen display) remained. Then suddenly, the Red Bang vanished and thus far (two hours later) I have not been plagued with the recurring "Signal Loss Alarm". Yippee, Ki Yay!
I am not sure if anything I did made the Bang go away. Interestingly, it did vanish about five minutes after the last app shut down and rebooting the phone.
Phone is Pixel 6 - Android version 13