Dynex DX-24L150A11 adding non-existing channels

Question

I bought this Dynex TV (DX-24L150A11) for my mother last summer, and it's been pretty good.  She has the most basic cable plan with Comcast (gets a few unscrambled channels with no cable box).  She gets local over-the-air HD channels just fine by having the cable hooked up.  It's her first HDTV, and she's loving the clarity.
She didn't want all the channels she could receive (home shopping, foreign language, etc), so I programmed the TV with just the channels she wants so that she can channel surf with the Channel +/- buttons.
The problem is that the TV randomly adds channels with no signal to the programmed list.  No one has programmed them in.  They just appear on the list.  So now when she uses the Channel +/- buttons, she is frustrated with all of the channels that have no picture.  There are probably 10-20 channels added to the list.
I have reprogrammed this TV at least 10 times over the last few months to remove the offending channels.  I updated the firmware.  We thought it would work better, but then the channels started appearing again.
I know she doesn't know how to program the TV, so she's not adding the channels herself (and why would she?).
What's wrong with this TV's firmware?  Is there something else that could be causing this (like maybe she's hitting some weird button combination on the remote)?

Answer 1

I saw this a long time ago.  The User *was* adding channels unkowingly when using the channel +/- buttons.  It seemed to occur when the button was pressed repeatedly very fast succession, instead of slowly or being held down.  It seems as if the controller thought the key presses were meaning to add channels...
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