Samsung LED with flashing standby light on front

Hello - I have a Samsung LED un40eh5300f, about 15 months old. The red LED standby light on front on the TV flashed and the volume display on the display is all the way down and constantly looks like someone is pressing the down volume button on a remote. I can override it for a second using my TV remote or the dongle button on the bottom of the TV. But the override is for a half second and the volume goes down. When I press my remote, the blinking red light gets brighter though. I took all the batteries out of all the remotes in my house, I moved the TV to several different rooms, turned of the wi-fi in the house, kept the TV unplugged for hours, unplugged everything from the TV except the power cord. Still same problem. Then it gets strange. I took it to my parents house 2 miles away to eliminate a rogue RF signal. The TV worked fine over there for several hours. I brought the TV back home, hooked it up, HDMI and power only, and the TV worked fine all night. This morning, TV is flashing red light again, with HDMI unplugged, in different rooms. Nothing changed at MY house overnight.

The flashing red light is fairly consistent no matter the time of day, but occasionally the volume will go all the way to the right, sticking there. Then once in a while the problem stops completely. The dongle button on the tv is clean btw.

My thought is RF interference from somewhere. Is there an RF received built into this model? Can I disable or change the frequency? Any other ideas?s