Fast forward to today when the same thing happened, so I tried to do the unplug/plug method TWICE and both times, no luck. This time, both of my other computers are disconnecting with me, the previous problem was just me disconnecting. I've got someone to look at my WinPFind3 Logs and it doesn't seem to be any problems with my computer.
I'm directly connected from ISP -> Modem -> Computer instead of using the Router, so only my computer has internet, while the other computers doesnt.
I called the my ISP today and they said nothing is wrong with it, the connection from the cable modem hasn't dropped since November.
So I'm not sure exactly what's wrong =/ I'm hoping someone here has any idea that can help me =(