Yesterday I did a ride I have done often, well at least part of it. I actually added a few new routes and made a 40km loop. On this loop are 3 existing climb 'segments' that Strava has recorded on other previous rides. Yesterday's ride http://app.strava.com/rides/4819269 is missing all 3 segments. I looked at the Map and it has recorded the course accurately but no segments. There was weather and when I reached the top of the climbs the clouds came in and I descended in the rain. I assumed there were no issues with rain as I have done many rides or been caught out in storms before and Strava has always recorded/received my GPS from iPhone. Maybe I have answered my own question, weather was to blame but I'm interested in other's experience with this. Thanks K P Thailand.