Right speaker intermittent

Rvpiano - In my garage system, I had the same problem as you.  I unplugged the integrated, opened the top panel and blasted all the knobs with this:

Wouldn't ya know it...  It worked.  Now, what works for my POS Aiwa garage receiver may not be the best choice for you.  There is no mention of the gear you are using.  If you are using say a good vintage Audio Research SP10 or SP11 multi-component preamp, hitting it with CRC is probably not a good idea.  My garage Aiwa, I could care less. 

The process is stated by others above, perhaps not completely.  Let me attempt to summarize:

1:  Switch speaker cables.  If it happens to left speaker and not the right (problem reversed) the problem is upstream of the speakers   If the problem does not occur in the left speaker, then the right speaker is the issue. 
2.  Check and clean all wired connections.  Check wires for visual and electrical integrity   If the problem is not solved, proceed below. 
3.  Clean the volume control and balance control if they are a physical and not virtual control (nob vs iPad as an example).   See if the is not solved, proceed below.    
4.  Look to your source or amplification.  Verify output/input maximum voltage specs to assure you are not clipping the inputs  I do not think it’s this but it’s a good check.  If this does not solve the problem, switch out components to determine the bad actor.  Send the component for service.

if i were a gambler, which i am not, i would bet on #3.  

 

Volume knobs needs to be cleaned and lubed or you have a bad interconnect or speaker wire is shorted.

One change at a time.

With every component?

Reverse speaker cables to isolate whether problem is with the speaker or further upstream.