Lately the radio in my 2006 Baja has been acting up. First only the front right speaker was working, days later only the left rear. Then all went silent for a couple of days. Today back to the front right speaker only. 

 

Any ideas?

I think 05s and maybe up a year or 2 have a reputation for bad solder joints on some elctronic parts. Any correlation with tapping/slapping the radio ?

I also don't think it would be unusual to have speakers become intermittent so, see what hapens after a door slam or 2. try to narrow-down headunit vs speakers.

 

tap right above the "3" button on my 05 Outback

There is a poor ground connection right at that location.

Hasn't happened in a while but that resulted in the entire HVAC unit /radio going blank.

Thanks for the replies 1LT and bb,  I'll try some troubleshooting as you suggested.