I have cordless cateye2 on both my training and racing bikes and they are now both playing-up.
They dont seem to be recording each revolution of the wheel, so the speed is erratic eg at 20mph theyll show anything from 0,4,8 etc.
Thought at first it was the batteries. Put some new ones in, but still the same problem. I have now found though that holding the computer close to the transmitter means it DOES pretty much pick up each rev.
So I guess I need to change the transmitters over? I didnt realise they had a life span of 1-2 years??