Did you happen to catch any of the messaging on the red screen?
Given the lack of reports and event logs, I would guess that it may be due to the Severe Weather Siren Announcement feature or the Panel RF Jam alarm? But then I do not see any severe weather messages within the last month and it looks like RF Jam Alarm may be disabled in your settings.
The first thing I would do is update firmware. The panel is on an old version according to ADC.
You will need to update incrementally, first to 4.1.1, steps here. Then update to 4.2.1.
Then update to 4.3.0.
There are a number of things these updates address, including cell reliability and bug fixes.