Only started happening when I went to a new avr. I was using my old speakera at the time(cerwin vega). They did it too. Not the pioneer, the marantz sr5007 I had for a few days did it too. Besides, running a rotel rmb 1095 power amp. Never had a problem until I switched over to new receiver and joined the digital age (hdmi)

2 Axiom M80s v3-custom
1 Axiom VP160 v3-custom
2 Axiom QS10HP
2 Cerwin Vega CMX 12's
Pioneer SC-57