Alright, all devices connected to this router get disconnected. And my computer is the only thing in the house to not be connected wirelessly, it is connected via powerline, which is 2 stations (1 by router and 1 by PC) that wirelessly connected to each other (faster than wireless and cheaper).
I have no idea how to check whether it is the line dropping or the wireless connection but when the internet does go down the light by internet on the router goes red (and I have to restart it to make it stop).
What do you mean by splitter? I have a small box that the router connects to and that goes into the wall if that's what you mean, same for the phone but it goes into a weird shaped box first (and then intothe splitter/filter thing).
Thanks for the help so far,