just a few questions:
what kind of connection are you on? DSL? Cable? You can try resetting your router, hopefully (and I'm assuming since you asked) you have no complicated settings, so just go to the back of the router and there should be a little hole that says reset, you need to stick a paper clip or something pointy in the hole and reset the router. Though it might not be the router, We have a cable modem and were having tons of problems with it, it was a motorola modem and there are 5 lights, the top one being power, and the bottom one flashes orange to show you're online. It kept resetting and then not connecting back to the internet, it was doing this a good 15 times per day, and we found out it was due to the wiring outside that the cable company did when they installed it. So they came and fixed it no problem, no charge. Let us know some more specifics, such as the modem indicators and the router indicators, and maybe we can help you better.
tricia.