I've been having trouble with my (Denon) receiver. Yesterday it abruptly started playing the front left and right audio channels through my rear left and right speakers as if they were my front ones, with increased volume and everything. I turned the receiver on and off a few times and eventually it started working correctly again. Now, today, it's abruptly stopped playing sound from the front right speaker. It will occasionally pop back in for a second. I'd assume this had to do with the speaker wire, except for its recent weirdness with the rear speakers. I reset the receiver and the problem persists. Does anyone have any ideas on what's wrong or how to fix this?