Denon PMA-2000ivr Amp cuts out, need advice

Hello everyone,
I've had this Denon PMA-2000irv amp from new in 1999. Always well cared for. Wonderful amp, great sound. Love this amp.
However it has developed a couple problems. I believe they are not related but I'll describe both just in case.

The main problem is the amp will just cut out completely for just a couple seconds and then click back on and perform fine. It does not happen very often and when it does it may do it a couple times and then go away. Amp works fine for a week or so and then does it again.
It has a main power button which when pushed in can be shut down with remote. Amp goes into sleep mode with the button pushed in but still consumes power.
I always turn the amp on and off with the button, never leave it in sleep mode.

The other problem seems to be with the selector switch for aux/tuner/phono/cd/etc. Sometimes it will suddenly change selection, clicking from cd to tuner, etc.
I figured it may have something to do with the remote mech and have covered the remote IR sensor with black tape. This seems to have stopped the problem.

I've had the cover off, everything looks really good, very clean, no outward signs of bulging, etc.

I live in a fairly remote mountain village and the closest Hi-Fi repair shop is in Calgary Canada, a full days drive away.
So my main question is if anyone has an idea what the trouble is and whether it's something that can still be repaired these days.
Cheers!