I have the same problem as everyone else has described. I have even tried wearing a wrist band to cover my watch when riding (to try and avoid outdoor mode coming on). However it seems to come on regardless. I think activating Strava might automatically turn Outdoor mode on - not just the amount of light the watch detects.
If I can't find a solution soon I'm going buy something that works properly. I can't ride for more than two hours with my watch going flat.... ☹️
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