None for me, I don't really understand how you can go from loving a piece of music to hating it... unless it was extremely overplayed, in which case one would normally stop at the point where the music becomes "boring", not continue until they actually hate it.
But I guess I'm not really the kind of person that "moves on" from artists, I still listen to Iron Maiden, Dream Theater, even a bit of Disturbed, and other bands which I have been listening to for quite a few years now, and some still remain as my favourite artists. I take breaks from them sure, but I always seem to revisit them
Also I agree with TheSilentHam.