Dynex LCD seems to have a faulty digital tuner?

Question

After WOW cable (and other cable companies) switched to the all digital format, my Dynex LCD started flipping out every time I try to use it. We don't have cable boxes or converter boxes, as we only have a basic package of 80-some channels. WOW told us we could use the digital tuner that came with all newer TVs to get our channels. And trust me, we were happy to throw the converter boxes and their awful remote controls back in their face.
Anyways, now my TV does some really strange things. While I'm watching it (at least 5 feet away the remote at all times, mind you), it changes the channel to some random channel number that we don't actually get. So say I'm on channel 23. It'll switch to channel 100.193 or something odd like that. And it'll tell me there's no signal. When I try to switch back to the channel I was on, it tells me again that there's no signal, then proceeds to scroll through all the channels, deleting each one as it goes, completely unprovoked. In order to watch TV again, I have to auto scan my channels again, which seems to take forver sometimes. Normally I have to do this 3-10 times a day, and it's getting really annoying. If I have to scan my channels every time I want to watch TV for more than hour, I'm going to go crazy. I don't have enough money to go out and buy a new TV again, and I'm not in charge of the cable bill so I don't get to tell anyone they're getting cable boxes. My grandma said she'd rather die than shell out money to the evil cable company for cable boxes because she "can live without TV happily." Well, I'm a typical 19 year old and I really can't. So I'm not sure what to do here. I've been told the digital tuner is probably broken, and I either need to replace it myself or take it back to the store to have it fixed. I'm not keen on hauling a 32" LCD back to Best Buy, nor am I prepared to tear open my TV and attempt to fix a digital tuner when I have no idea what one looks like or how to go about replacing it. Is there anything I can do besides unhooking everything and trying to take it back? I sleep with my TV on and it's kind-of scary to wake up in the middle of the night and watch my TV scroll through channels by itself.
Also, this is the only LCD in the house that does this, but it's also the only Dynex. All 3 of our LCDs are different brands.
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Answer 1

I think your assessment of the issue is on point. Sounds like either A) Problem with your cable company or B) Finicky tuner...probably the latter.
If you bought it less than a year ago, that is the type of thing that should be replaceable under manufacturer's warranty. If you bought it more than a year ago (assuming you did not buy Best Buy's Geek Squad Black Tie Protection), you will have to pay them to assess and service the faulty components. Unfortunately you will have to bring the TV back to the nearest store to you either way. :/
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