CURSOR RESPONSIVENESS

If the buttons work but simply stick don't click etc, but work with a firm press its almost 100% dirt just the same as dirty pots in mixers etc.
Very easy to fix with electrical switch cleaner hence its name.
geoff

I know this is a few years late as a reply but I have the same problem and just did a search. As I was reading the posts it struck me that plugging a keyboard into the usb and using the cursor keys might be an alternative. It does work and although not an ideal solution, it is an option as a last resort.