I've noticed that my Edge 1030 will sometimes shut down and reboot after the 12.20 update. Today, I finally caught it in action when it shut down and automatically started a reboot after a Shimano Di2 shift. Normally I just catch the reboot without knowing what caused it. I don't have much else connected to the 1030, just a hub speed sensor, a couple of widgets, and the usual iPhone notifications. The Di2 is significantly charged with recent updates on all components including the bluetooth wireless unit, which is another story if you only own Mac computers. Has anybody else seen this issue with the Di2 connection?