About a week ago they introduced a new interface to the dashboard website (it must be catching....) which I think is completely counter-intuitive and now it seems to have slowed to a halt! There's even a message on the front page that the segment feature is unavailable due to 'popularity'?
Thankfully I have an iPad app that pulls my data down which seems not to be quite so badly affected. I pity anyone who just invested in a new piece of Garmin kit - you must be getting a very bad first experience right now.