I've had a Varia for a couple of years, no issues at all. Last week the radar & light disappeared from my 1030. I could re-connect the radar after searching for new devices, but it refused to find the light. Removing the radar, searching for lights, no joy.
This adding by ANT+ID worked a treat.
Thanks for the tip. Brilliant.
I realise this tip doesn't actually answer the original question, but it's such a good tip, it deserves an up vote.