Tx Buffers write cycle

We are having a problem on our Netware 5.1 server. When we load Faxserve we start receiving the following message on the server console.

Txbuffers write cycle errors over and over. If we unload faxserve the errors stop. You cant get support on Faxserve 5 anymore so I was wondering if this is a faxserver error or a Novell error