My first 76C failed. Batteries seamed to loose contact. I could just tap it and it would go off. Tried to bend battery contact and it broke. Shoved a wire behind it and added tape to batteries to keep them from moving and it is now working on bike. Bought 2nd unit for backup while I send in first unit form repair. Used 2nd unit this weekend. On 2nd day it started shutting down. Could not get it to stay on. Traded it with a guy in our group as I was leading. That night it would stay on with hard hits? However it now has a rattle. My old e-map did the same thing and the repair note from Garmin said that the "super cap" had come loose. I think they need some epoxy on the heavy parts with only two leads.