Krenic

So I am facing a...really odd problem with second life. I have gotten a new modem , and since then the problem with SL started, I ALWAYS get disconnected after 2-5 minutes. So I figured the issue is the modem or the ports of it or something, ALTHOUGH my desktop which is also connected to the modem...works fine? I have no issues on my desktop regarding SL, just on my laptop. I disabled my laptop's firewalls, my modem's firewalls briefly to test, I still get disconnected. Other games on my laptop work just fine, smoothly even, and before the new modem I used to play on a wireless with no issues at all. Aaaaaaanyone have an idea of how to help me there?