Thanks for the suggestion, nivalcckw. I can confirm we built a rule task that disables the write filter every night to allow the antivirus updates to be written to the drive. We have another rule task that re-enables the write filter several hours later prior to our agents logging back in to the thin clients.
We did get this ticket escalated to level 3 and they provided an updated graphics driver along with a .BAT file that they have asked us to run that makes some registry changes. We deployed the new graphics driver/BAT file to 10 thin clients that are running our standard image. So far we have not expierenced any freezes with these 10 thin clients... *knock on wood*. I will post another update soon.