I have that bike computer. In the setup , make sure you have auto pause enabled...that should (with Cateye one never knows) start the computer when you start rolling.

With regard to connecting to sensors, lots of different factors I've found...with me one of them involves the sensors of another bike with which I use the Padrone.

Do you use your phone to connect? That sometimes creates a lag. The phone is essential if you want to export the ride data, but if all you want is on the fly info, try going direct connect. That's usually the most accurate and doesn't have BT "hiccups."