Seems that the problem is that you are using a Garmin. Why not pick up a refurbished PC7 for less money than your "feature packed" and buggy Garmins? My life has improved so much since I switched from a PowerTap and Garmin setup to a SRM/SRM setup. It just works. If you want to do social media activities like tracking your routes via mapmyride/Strava, you can always use your phone. At least the important stuff will be super duper reliable (e.g., power, HR, speed, cadence).