This original thread fits EXACTLY the symptoms I am experiencing excepting the time period, which ranges from 20-60 minutes.
I have followed all of the steps that the poster in that thread did, both pre-thread and the instructions given in that actual thread.
I have altered my eqclient.ini to the one present in that thread, but have a backup saved so I can give my original video mode stats if need be.
Willing to offer any information necessary to fix this problem. I too am running a Intel Core 2 Q6600 with Vista 64; my vid card is the Nvidia Geforce 8800 GT.
Thanks in advance people.