I'm using a Cateye Enduro 8 computer (yes, it's an MTB one ...) and the last couple of rides it's developed a habit of "cutting out" from time to time. But here's the infurating part, especially since I like to monitor my average speed. It only happens on downhills! I'm sure the problem's at the computer end rather than the sensor, because if I handle the computer (or sometimes hit it, sometimes VERY hard) it starts working again. If I don't touch it, then sometimes it starts by itself in the end, but otherwise it will just read zero, or very low mph figures, occasionally it will read about half my actual speed for a while.

Anyone want to hazard a guess why this is happening? I've checked that it's seated in the mount correctly. The computer is only about nine months old so it shouldn't be the battery (and why would a low battery cause that problem anyway?).

Thanks in advance for any opinions