I had the same problem with a cateye wireless and I sent it back but it was past 30 days and they gave me a new one in box, not any refund that I wanted. So it's still in the box. I ride slower as a result, but I like not being distracted by the little numbers on my handle bars. Only time i miss it is during hill repeats and intervals, which I kind of do in my head instead. It ain't perfect, but really, who really cares about all those number? Also, I know when the chain needs lube - it talks to me funny. Don't need a distance related maintenance schedule