I am almost afraid to say that the power dropouts have gone away for fear of JINX, but as far as the structured workouts go, things are perfect.
I had been getting frequent maddening power dropouts during a workout despite keeping my effort and cadence unchanged. The drops weren’t all the way to zero, but deep enough for the “MORE POWER” warning to show up. I am pretty sure that the “3 sec average” option was selected during these dropouts.
So what did I change.
TWO FULL TURNS. I wasn’t following this recommendation perfectly. Now I tighten the Snap until the wheel makes contact with the roller and then give it exactly two more full turns. I put a piece of tape on the knob so I can tell how much I have turned. Wahoo should put a white dot on the knob to help with this.
ACTIVE USB CABLE: I switched from a passive 10 foot USB extension to a 16 foot active cable. I am not sure how important this was. Especially since the active cable i bought was only a USB 1.1 cable (http://www.amazon.com/gp/product/B0001STJ6M?psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00) . However, I probably should have started with a shorter passive cable. The Belkin dongle is just a few inches behind the Snap. I tried different positions earlier without success.
This may all be just coincidence. However, previously I couldn’t tell from the Strava power graph that I was doing intervals. Now they look spot on.