I have a nss 400 in place at a customers. The firmware is current. i t usually works fine, except that it drops connection and users can't get to the folders. They get a message that drive:x is not available and a semaphore timeout has occurred. the obnly way to get them back in is to reboot the nss 4000. The box is wired to a CE520 using etherchannel on two married ports.