Interesting thread. I had my Zumo die on a trip over Memorial Day. Pulled it off to go eat and when I put it back on it was dead. Nothing, nada. Had paper maps for the rest of the trip but was a bit bummed to lose the trip log. Once I got home, I took the battery off, cleaned the contacts, and it came back to life. Hasn't failed again, and I just did a 400 mile trip to Sequoia this weekend in blazingly hot temps on the return trip. Guess these things are a bit finicky.
2013 Triumph Tiger Explorer