I thought I'd check with some other powertap users on this one, since Saris is closed until Monday and I have exhausted my own ability to troubleshoot.
My head unit keeps losing the signal. The transmission icon is lit up but the power and other readings become dashed lines - sometimes for a second or two and sometimes for longer. Yesterday's ride was missing about 3 miles for what's normally a 25 mile ride, so it's really off.
First thing I did was tinker with the shark fin placement. That seemed to have no effect. Next thing I did was replace the battery in the head unit. (I replaced the hub batteries about a month ago). That didn't work.
Today I noticed the power reading was also really buggy - for example, I was going up a hill and it was reading at least 60 watts lower than it should be for my effort. Other times I was on a flat section and it wasn't reading any power or cadence, just showing zeros.
There are two things that happened just before this started. I dropped the head unit. It only fell about 1.5 feet, but it hit pavement. I also was fixing a flat back tire and knocked the shark fin completely out of position.
I'm guessing I either messed up the head unit when I dropped it or knocked a wire loose when I moved the shark fin.
Has anyone else ever had this happen?