I have had this problem on this same model (F32650) and I discovered that what is happening is that dust and debris are causing the microswitches in the panel to short, therefore the channel starts changing and wont stop or the volume changes etc...
Get some electronic switch cleaner and (with the power off of course!) spray into the crevaces around each button and press each button a few times and then power the unit back on and it should be fine.
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