Router problems with Teamspeak and other apps

[kendallm]

Behind a DLink DI604 Router (DSL line) with Nat obviously enabled. I cannot run TS and another app. EG. I can run Enemy Territory OR I can run Teamspeak but not both at the same time. When I run both the router resets itself. The log files indicate a PADT (PPPoE Active Discovery Terminate). Any idea why this is happening?

Thanks,

Kendall