My Garmin 520 has started an annoying pattern. I turn it on, it finds the satellites and gets to the start screen. I push the start button and start to ride. The time starts recording immediately, but the distance doesn't start for 1-2 minutes, so I typically lose .3-.6 miles at the beginning of a ride. Seems to work fine otherwise.
I am up to date on firmware and have done a reset.
Very annoying.