Need your expertise guys..recently upgraded to a pair of kismet amps and speakers (kismet floorstanders not liquids). Preamp is a Candela…everything was fine but for the last two days, suddenly in the middle of playing, I hear a loud thump on my right speaker and the right channel goes out…sometimes , turning off the pre and the amp and turning it back on fixes it..sometimes not..sometimes, if I stop playing music but leave it on, I hear the thump again randomly and the right channel is back on..thoughts?