My Belkin n300 is keep losing connection. HELP!?

my new belkin just started to lose connection. it happens every five Minutes or so. And when i try to go on some websites (like youtube for example) it dosn't work at all, videos or pics. i always restart it, but that doesn't solve it for long. its connected to my modem. i just lately changed my modem, so it cant be that. i have it normally connected to my two laptops (wireless) and my desktop, but now i don't use it, so i can only use one computer, and i really need all of them working. is there some how i can fix it with out replacing the router? help!! i don't know what to do anymore... help!!! oh i also changed the e-wire thingy, so i dont think it could be that.