I had the same problem with the STR DE445. I used to just walk up and give the thing a smack, and eventually the dropped speakers would come back on. It started with the rear, but after my last move the other channels started to deop. On the 445 there are only 3 blue relays. Touching any one of them would turn off the L/R, Center, or Rear speakers (depending on the one touched). Not having a magnifying glass I went ahead and resoldered all of the connections on each relay. It appears to have worked.

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