HMT-2250-6T keeps dropping connection (slowly degrading RSSI)

[MaxDev98]

Hey guys,

i do have three inverters running of my OpenDTU:

• 2x HMT-1800-4T (WR Fahrrad vorn and WR Fahrrad hinten)
• 1x HMT-2250-6T (WR Schuppen)

Die HMT-2250-6T was been added later on.
The two HMT-1600-4T have been running since last summer without any issues - but i noticed that the new 2250-6T inverter (only 3 meters away from the OpenDTU) keeps disconnecting.

Sometimes cycling the AC Grid power (without disconnecting the modules) helps and the inverter will be reachable for OpenDTU again.
There are no other errors shown in OpenDTU / reported by the inverter. Meanwhile the other two inverters are still reachable and working.

Not confirmed yet, but it looks like the inverter is still producing energy and only the communication is broken.

I did notice dropping RSSI signal levels over a couple of hours until the device becomes unreachable.
You'll find some screenshots attached.

On other days (same solar load, more load, less load) everything remains normal and works as its supposed to be.

Did anyone noticed a similar issue or knows how to fix it?
I'm not quite sure if it is a OpenDTU or inverter related problem...

Thanks!
Max

The log seems to only show success messages from the 2 reachable inverters and nothing received messages from the offline inverter.