We have a shared storage from NetApp mounted onto about 80 systems (all running Ubuntu 10.04 64 bit). These days there is some problem with the loading of user homes onto the lab machines (authentication is instantaneous). File Manager takes too long. Desktop items appear after quite long time say 2-3 minutes. Starting Google Chrome shows "building cache..." and it stucks there". Firefox starts but does not open any website. This behaviour is seen for every 3 out of 5 login attempts, means for the other 2 attempts it works fine. Its not even fixed for a few machines. All are behaving in a similar manner.
Any hints what could be the reason, from where should i start debugging ??