Cumulus Support

I've been trying out my new Ecowitt GW1003 station for the last few days. Everything looked good, until yesterday around midnight -for whatever reason- the Pi4 that runs CumulusMX stopped working. I rebooted this morning, but although it's been raining on-off for the last 24 hours, no more rain is beeing registered.
Strangely, the Ecowitt WS View app and my old station (WH1080) show the rain correctly:
So, I switched on debugging and poured a bit of water into the offending rain gauge (clack - clack - clack ...). This was between 15:10 and 15:11 hours. The app showed the additional "rain", CumulusMX did not. I've attached the log file for the respective time period. What's wrong here?

I should have included the log file with the GW1000 errors, so here it is ...

did the rain appear on the main dashboard and Now screens?

did the rain appear on the main dashboard and Now screens?

The dashboard showed zero rain all day, I didn't check the Now screen.

Some more restarts of CumulusMX, reboot of the Pi4 and the GW1000 didn't help. So I exchanged the Pi4 for a Pi3 and it started recording the rain again. I have to say that the CumulusMX folder resides on a memory stick, so all I did was unplug it from the Pi4 and plug it into the Pi3. The only difference I can see is that the Pi4 runs Ubuntu Server 21.04 with Mono 6.12, while the Pi3 runs the native Raspberry Pi OS Lite with Mono 5.18, both fully updated. Very strange ...

OK, that is really odd!