I haven't really noticed any cc effect doing it, but it is always in combat. but all in all, it happens 1 out of every 3 potion or stone I use, that is a lot. But it could very well be when you are being hit by an attack. But I have never had problems in Icewind pass or the valley. But every other Dungeon and zone.
If people want a really good group to hang out with, then this is the right place! I have been in this group for almost a year now, and I am having the best time in my life when I come online. But you have to remember that this is a social group, so I people don't care about that, then this is not the place.