Yes, they're known for doing that.
They're also ridiculously difficult to take care of compared to other colors. I have a pair that's literally a reclamation mission at this point because they accidentally got salt on them.
So, if you're in a climate where there's any sort of winter precipitation, stay AWAY.
I should also note that I've had a pair of Sand and Lilac Uggs for 2 or 4 years without problems. So I'm not an idiot about how to properly take care of them.
Black is, IMO, the worst color because it's so fragile and high maintenance.