funny this came up...
i was fishing at a nearby lake today and was having a horrible time with line tangling around my reel seat and reel handle.
at the time i didn't think much about it and kinda blew it off, just a bad day.
but now thinking back to this afternoon, there was a pretty stiff breeze blowing the whole time i was fishing.
i was making some long casts and had a good bit of stripped line at my feet.
so i'm gonna say that a bit of wind combined with a pile of fly line = problems.