I am now dealing with my first Ant+ device (Bontrager Cycling Computer with Cadence/Speed sensors). This was installed by my LBS and for a couple weeks worked just fine.

Today neither cadence or speed were there. The Bontrager instructions are 'not very rich', so I tried to go through pairing again. As best as I can tell this requires stepping through all the setup stuff (enter time, date, wheel size, and so on - not hard). The last step should take you to pairing. Instead it just said 'done' - and it was done (and no cadence or speed).

I finally gave up and just started my ride. Roughly 3 miles out (call it 10 minutes) speed and cadence just appeared. And it was rock solid for the next 67 miles. From what I can tell cadence and speed are now gone again.

I have never dealt with Ant+ so I don't really know exactly what to expect here. So some questions.

1) I assume that once 'you are paired' that no repairing is normally required. Is that right? Is losing pairing common? Note that it happens on two sensors simultaneously.

2) How does an Ant+ sensor 'know' that it is pairing? Does it have the ability to 'listen' to a signal from the computer so start broadcasting? Does it always send signals that the computer can sense and use for pairing purposes?

3) Does this sound like a common Ant+ problem? How do folks 'typically pair' a new sensor? I'm suspicious of my computer instructions because I have encountered at least one other scenario (Start New Ride) that absolutely does not match the instructions.

dave