Avid Artist Mix strange behavior

Hi, i have a setup involving the artist mix and transport along with a couple of usb devices and it worked perfectly until this weekend i decided to turn another pc into a network nas/usb server. the whole system still works as expected with the only difference being the artist mix is not as smooth as it was…and cubase crashes now (i had no crashes whatsoever before). if anyone has any experience with networks and the avids please help…i have to mention that the avids are on a separate pci lan card and not the onboard pci where the internet/nas etc are located.