Hi! Having problems with Sony STR-DB780 & Eltax speaker package.. My centre speaker sometimes decides not to work, I hear a 'click' and then no sound is heard. I can be watching a DVD for example, and everything is fine. All speakers are working correctly. But then if I pause the DVD player, or mute the input to the receiver in any way, and resume, the centre speaker fails to output any sound. It never clicks off during a scene or track, only if I stop the input and re-start. Then if I pause and un-pause the DVD coupla times, the centre speaker will click back on again! It happens with all of my input sources (DVD, CD, PSX, etc). Any ideas?