poping in one of the speakers

Hello In my preamp with or with out the remote ,if I hit the input selector, or put the amp in mute I get a pop through my left speaker, if I let the remote run up or down on the volume about every 2 seconds it will pop ? what is this and how to fix , the brand of the unit is not important ,it is
a expensive pre, thank you .
The brand would be of importance..........
If it is a tube preamp, it could be a failing tube. This has been the case in my experience with a similar situation.

If you do have a tube pre, try swappping the L&R tubes to check if the popping switches to the right speaker.
Tubes do this. But we don't know what pre you have.