If you haven't already, try setting up a Static IP.
Here are some links:
Guide to Portforwarding Teamspeak 3:
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portforward.com/english/ ··· rver.htm^May need to change router, I just took a guess.
Program to Easily set up Static IP:
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portforward.com/help/set ··· ress.htmProgram to check and see if the ports were opened:
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portforward.com/help/por ··· heck.htm