A problem with two accountsFollow

I have had an EQ account for awhile now. Recently I purchased a second copy and set up a second account so me and my wife could play together, but we cant. If we are both in different zones, we can play with no problem. But whenever we are both in the same zone the one to enter the zone last will get disconnected in about five minutes. If one of us zones out of the zone we are both in, the other one gets disconnected. Wierd huh?
There has never been a problem with my computer running EQ or her computer running EQ.
All display drivers are up to date, we are on a DSL Router (the port triggering is correct I think), and both computers are up to the system requirements.
I wonder if anyone else has ever heard of this problem and if so how to fix it. Any ideas would be greatly appreciated. Thanks.