PS AUDIO PREMIER

Years ago, I owned a PS Audio premier power regenerator. I enjoyed having it, but had to send it back because it was reacting to some kind of problem with the incoming power line. Sometimes at night I would hear it click as if it was adjusting to something on the AC line. Thing is, it was turned off. PS Audio sent it back after making a new grounding scheme for it. It was no use,same trouble. I sold the unit and went a different direction. So, my question is, has anyone else had issues with this unit? I am tempted to buy one again hoping for a better result< since they are going for 'cheap' nowadays.