This sounds like a cable issue. Try a different one. Standard to mini-USB cables are fairly common these days; a lot of cameras and cell phones use them.
As far as repair? There are no repair services available. It simply would cost more (just for the diagnostic) than what a new player sells for. But, if it’s not the cable and it is indeed the player that is at fault, you may be able to get it replaced by SanDisk under warranty, depending on its age. If you’re in the EU, I believe the warranty may be 2 years. It’s 1 year in the States. You can contact Sandisk Tech Support for more info.
