someone stated in another thread here at AT that the issue has since been addressed. while i can't remember who posted it, or which exact thread its in, i did not buy these fans until after the issue was supposedly corrected. i currently have some mounted vertically and some mounted horizontally. i haven't had problems with any of them yet...then again, i've only been using them for a few months now. assuming the issue doesn't eventually crop up, these fans do exactly what i want them to do - move more air than just about any other 120mm fan at the same rpm, all while being one of the quietest (2nd only to my Scythe Kaze Jyun 120mms fans).