My internet wasn't working for the past two days, so my mother called a repair man to see what was up. He found the problem, and it got resolved.

My sister has a PC and I have a laptop. I used Wi-fi and she used to have cable on hers. The repair man said that my sister's PC had to be Wi-fi for now on. When my sister and I tried to use the internet, it didn't work. It keep disconnecting and stuff. It was frustrating. We thought it was momentary so we waited for quite a while until we started to use it again. We were going to play Left 4 Dead 2, but apparently the internet still kept disconnecting on us. The repair man said that it would be working just fine now, but it got worse. So yeah ...
I think it doesn't work because there's about 5 or more things connected to the Wi-fi but I'm not sure.