That’s tough. How long was your warranty for?
I had this issue on an on and it kept getting worse until I couldn’t get output at all. I finally listened to a guitar tech and sprayed some contact cleaner on the contacts on the back.
Do this while it is powered off and give it time to dry. I used CNC Electrical Cleaner (15ish a bottle).
I’m not even kidding, it went from doing this consistently, to NOT DOING IT AGAIN SINCE. Not even once for two months now.
I change a lot of the I/O on the board pretty often depending on where I’m playing. I guess it must have a little smudge and there is some kind of resistance indication on the plugs (maybe to resist overheating and shorts?).
Did you by chance try a factory reset?