Solved .... the problem is in Windows 8 the Windows Defender, or in Windows 7 the Security Suite..... turn that POS off and will not give any more trouble. Also excluding the after effects process or mov extension do the trick, but mostry excluding the process even accellerate the renders.... what is weird it why this do not happen with the local storage and only with the iSCSI mounted storage.... but it is certainly that software what causes the issue.......
I think you already have your answer: don't use AE to render to a network.
It may not be the answer you wanted to see, but AE has difficulties with networks. Consider yourself lucky that you got AE to work AT ALL over a network. I fear the honeymoon may be over.
The only other things that may be an impediment would be anti-virus/firewall sorts of software.
wonder if you read my previous post answering to myself?
It is actually not a network drive, is is a NFTS drive mounted over iSCSI, its not a NFS volume. Workd fine for over a year, until last Windows Defender update... and it is actually fasted than my local drives since the local drives are simple SATA drives and this is a 48 Drives RAID connected over 10 GigE iSCSI and with a performance of 1050 MB/s.
Even our projects are saved on these iSCSI volumes, so all the rooms we have can work from the same project without having to duplicate media or projects between rooms, so producers can jump from room to room with the projects if the artist is bussy with something else and they need changes, someone else can take care of it...