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Re: Samsung STB changes channl on it's own.
Low remote batteries result in mis-signalling when the remote is used, the most common ones being the TV botton changing channel, and I think the volume buttons to power off.
If it changes when the remote is not in use, then it could be seeing another remote, though IR remotes do not have a huge range and cannot go through walls, or it could be CFL interference.
Another thing, try the CH +/- buttons on the STB and make sure they both work, they might have been knocked and stuck half pressed.
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