RX Fail: Receive Nothing

[kokospoko654]

I'm having a problem with my OpenDTU. I've been using it for two months. Sometimes it wouldn't communicate with the inverter, and sometimes the web interface (website) wouldn't work and I had to reset it. A friend asked me to make him an OpenDTU. I bought it, configured it, and connected to his inverter. Since then, mine hasn't worked. I keep getting RX Fail: Receive Nothing, and the radio information is:
CMT2300A Status configured
CMT2300A Chip Status connected

I'm about 1.5-2 meters away, and I've been trying to connect for two days now. :( PV production is working normally.
I've reset the ESP32 multiple times, re-uploaded the firmware, even changed the connections (and changed the pin mapping). No effect...