Over the last week, I started to notice a POP from the speakers as the x4000 is powered down. Until now, there was only a click from within the AVR. And a couple of times while the unit was powered up but not actually playing any source, I heard some quiet static from the speakers.
After not using the AVR for a few days, yesterday it went into protection mode (fast red flashing) within a couple of minutes after I turned the unit on. Clearly this wasn't from overheating. I do not have 4 ohm speakers, and it wasn't playing loud. So I checked to make sure there were no loose speaker wires shorting any of the contacts, unplugged and replugged all of the sources (HDMI), and turned on the AVR again. The same thing happened a couple more times.
Then, after keeping it on long enough to save a config file (which wasn't full of zeroes), I did a microprocessor reset and reloaded the config file. Since then the problem hasn't occurred again.
So am I right in assuming that if this happens again, the unit should go to Denon service for repair? I bought it from AV Science late last year, so it's still under warranty.
AT&T U-Verse Northeast Ohio
Denon x4000, Carver m1.0t, Samsung LED TV, B&W 704 mains, two M&K subwoofers, Oppo 103, Roku 2, etc.
Headphone system: Sennheiser HD600, AKG K702, Hifiman HE-400i, Marantz HD-DAC1 (also used for music playback in the main system, Marantz CD5004, Denon DVD-3910