Ive had the same Cateye micro wireless computer on my mountain bike for about 3 years, which in itself is amazing that I have not broken or lost it, a testiment to cateye quality. anyways, the past two rides its decided to totally reset itself, to the point it wants to know what units I want to use. first time i thought it was a fluke, second time I realized I must have an issue. the battery is fairly new, just a month or so old and the LED is very solid. not sure there is anything to really fix but thought Id throw it out here in case anybody has had the same issue or might know of a fix. I guess I should be impressed ive gotten the life I have out of it and get a new one.