Hi everyone. For some time now, I've started noticing strange behavior from my Xiegu G90. The first thing that worried me is that on the 18MHz band, transmitting almost never works properly - at least according to the display. Whether I blow into the mic, whistle, tap it with my finger, or say something, the radio goes into transmit mode at full power and holds that power the entire time until I release the PTT button. Even when I'm not saying anything, and the room is completely silent, the transmit bar on the waterfall is perfectly steady, and the power stays at 20W the whole time. This only happens on this band, making it almost impossible to use. This is in SSB, of course. The problem occurs regardless of whether I transmit with the ATU on or off.
Another issue has happened only twice so far. When I tried to turn the radio off, there was no characteristic click — the screen went dark, and the mic lit up green. After briefly pressing the power button again, the screen turned on and showed a red 'COMM LOST' message. Nothing could be done with the radio at that point, the only solution was to disconnect it from power.
Another problem: on the 12M band, the radio transmits at a maximum power of 13W, no more, even though it's set to the normal 20W and SWR is good (close to 1:1).
The last thing I've observed is that on 20m and higher bands, sometimes after releasing PTT, the waterfall 'mirrors symmetrically' - you see exactly the same signals on both sides.
Firmware version is V1.80 for both the head unit and the radio itself.
I'm asking because I don't know what to think. I'm quite new to this hobby. Maybe someone has encountered something similar and could tell me what's going on with my radio. I'd be grateful for any help because I don't know if this is a firmware issue or something physically wrong with the radio. Thanks in advance.