That is a very common complaint. Do you wear any hand lotions, sunscreen, or have sharp fingernails? They will chew up the buttons. The radios are so cheap now that IMHO, just buy a new one that comes with the radio unlock code and plug-play.
You are not alone. I am having the exact same problem. Also, my power window buttons and my power mirror control switch are pealing. The power window and mirror switch are cheap enough and easy enough to replace. I used a website that sells new VW parts at wholesale price. Very reasonable. As far as the radio goes, I am waiting until I have a little extra money so I can replace the entire unit with a nav system. I don't like aftermarket radios, but some of these nav units look like OEM so that is what I will go with.
I don't know of any way to replace radio buttons individually. If someone knows of a way, I would like to hear about it.
FYI you can't replace the faceplate because I remember reading somewhere that someone tried that and it didn't work. If you took apart the faceplate you could probably reuse the buttons but I don't know if it comes apart. Plus, the OEM Premium 6 radios are so cheap now it's not a bad idea just to buy a good condition used one.
They have good customer service. They messed up an order once, but they took care of it very quickly and at no cost to me. Shipping is reasonable, but it is cheaper if you buy several things at once since they have a minimum shipping amount. I paid about the same amount of shipping for front rotors and pads as I did for the power window switch.
Make sure you include your VIN number when you order. They will check your VIN to make sure the parts you order will fit your car.
As far as the radio, you might want to look for used. I just checked and they do list a few different radios, but they seem expensive to me.
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