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there is every possibility that the channel (ch - and ch +) button on the TV is stuck. This can make the TV channels change by itself. This also applies to the remote control (if any).
Turn off the TV, use your thumb to flip through the channel (ch - and ch +) button on the TV. This will free the stuck button. Also, check the channel (ch - and ch +) buttons on the remove and make sure it is also not stuck in.
If the above doesn't solve the problem, then it means fault is from the control board inside the TV. It maybe defective or needs servicing.
The board controls the buttons on the TV and it can be found on the position of the channel (ch - and ch +) inside the TV.
Note that TV stores a lot of current. So if you want to disassemble the TV to check the board allow the current to discharge by remove the TV plug from the wall and wait for about 1 hour before attempting to disassemble the TV.
The channel selector button is stuck possibly it has failed and needs to be replaced. Have a tech replace it for you. If problem remains you will need to replace your electronic tuner. Your tech will replace that for you also
I just fixed the problem very easy... The RCA have a front cabinet which is very easy to remove. I took it out and the only thing that is expose is the speakers and the sensor control. Is a little panel about 5" just spray it with dust spray and that what I did Is not changing channels by itself anymore. I save $3,000 I was about to trash it. Im happy I did that...
the button cluster in the front may have a bad tack switch(button) or the buttons may have loose connections. you can take the speaker grill off and look yourself...watch for wires..unplug your tv first:) also if you use spray cleaner that may have seeped into the button cluster too...you may be able to get the cluster as a whole from a local tv repair shop and put it in yourself..save labor charges:)
Though you have not mentioned model and brand of your tv so I can offer a tip only here.
Check in what order tv changes its channels, like if its in forward order, +Preset or +Channel knob would be stuck. If its changing in reverse order, check -Channel knob at front of tv.
Hope this info would be helpful.