For about the past month, my Garmin 920xt has developed a weird glitch. I don't use activity tracking, but anytime I upload a workout (manually over automatically, both over home wifi network), it turns activity tracking on. And then it buzzes at me to move if the watch sits still for a while. So I keep having to go into the menu to turn it off. I reset the defaults at Garmin's suggestion, but the problem recurred. Garmin has no further suggestions to offer, except to replace the hardware. I can't imagine it's anything except a software problem, presumably from the most recent update (version 9.20, coincidentally). My watch was recently replaced under warranty due to the altimeter failing (presumably from salt from ocean swims building up in the sensor), and the replacement is out of its short warranty period. Anyone else experiencing this or have any words of wisdom to offer?