I suspect it will only get worse over time, sounds like you need some service. Don't expect it to be cheap and shipping will cost a ton too..... Something is dying in your amps power supply, it likley won't improve over time but I'd bet it WILL get worse.
I canot say how long it will last but doubt you'll get more than a couple months as is.
I canot say how long it will last but doubt you'll get more than a couple months as is.