Powerlinc 2413U Power Failure

I keep getting an audible "Power failure" intermittently in the user interface and 2 red lines through Powerlinc in the bottom left hand corner. I am also having trouble adding new devices, which are "not responding". Some times, though occasionally, timers fail to respond, and lights don't turn on and off, but most of the time continue to work fine, probably 90% of the time.
Does all this mean the powerlinc modem has failed and needs to be replaced, or could there be some other issue

[jay (support)]

Check out the signal troubleshooting guide to see if you can determine if it's just signal noise (fairly likely) or if it's really a failed PowerLinc.

And I've had some success with leaving mine unplugged for a few days. Be sure to unplug the USB connection as well, as it can draw some power from it.