"Limited Or No Connectivity" When Using Video Chat?

I've noticed when using skype, or other webchat utilities like omegle - chatroulette, that the conversation can only last anywhere from a matter of seconds to 20 or 30 minutes before the connection quality drops and i get "limited or no connectivity" for my internet connection. I must reboot to get internet connectivity back, sometimes a couple times. Usually the first attempt will last at least 5 minutes, then subsequent attempts - after restarts - seem to get shorter and shorter sometimes only last a few seconds even. A few times i have been able to time skype calls because at exactly 3 minutes the internet would drop me.I have tried going to options - connections - unchecking pnp, or unchecking ALL boxes ive even heard in some posts. Tried that with not much effect. I have made sure that my firewall has exceptions for skype.

I have tried forwarding the port on my router that skype claims to use for connections in the options. I am using a linksys wrt54g wireless router but my connection is hardlines to the router. I am using an archaic form of DSL that is very slow on a phone line that has degraded but I am still able to play high-bandwidth using multiplayer games for long periods of time with no interruption. I recently took my computer to another persons house with a new router and much higher bandwidth connection and had the same problem. I have also noticed this problem when downloading torrents but reducing the number of peer connections seemed to greatly improve the problem - not completely eliminate it. I suspect it may have something to do with my hardware? I also remember clearing all temp files and resetting internet options helped for a little while but the problem came back quickly. Sometimes I have been able to have longer skype calls that last a good amount of time and it doesnt drop me but that is rare, i dont know why that is. I am almost beginning to think I have some sort of a virus that is interferring with the internet at times possibly from some remote source because the actions it takes seem to be "intelligent" at times but maybe I am just paranoid.

A couple odd things to mention that may mean somethingAfter restarting my pc a couple times to regain internet connection and retry my skype call, sometimes instead of my internet connection disconnecting i actually get a BSOD and my computer automatically reboots itself. Not often maybe 1 out of 10 restarts. It says something aboutIRQL_DRIVER_NOT_EQUAL_LESS something but its fast. this hasnt happened with chatroulette or omegle JUST skype.Also i noticed at my residence i cannot remove the router and hardline connect right to the modem it gives me "limited or no connectivity" at the house with the faster internet i went to, i could not use their router i had to hardline to the modem - the router would give me "limited or no connectivity"