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Level 7

TCL R617 Keeps losing scanned channels

Our R617 usually works wonderfully with OTH channels for a while, but then loses the signal to all scanned channels. (We don't have cable.) The channel numbers and the viewer information are still there, but every channel is black. I have to unplug the TV and rescan the channels which usually solves the problem. But it's incredibly annoying. Does anyone have any reason why this is happening on a week-old television?