I've logged several rides with my Edge 530 with speed, cadence, and power sensors now. I originally set it up with bluetooth and the numbers looked fine. But I switched to ANT+ since it's supposed to be a more reliable protocol. But instead my cadence values have been mysteriously dropping intermittently from 80-90 to 60-65. You can see this in the output of the data, with drops every minute or so for about 5-10 seconds before returning to 80-90 seconds.
Why is this happening? What can I do?