internet/router issue, help!

[Anderdale]

Lately every couple weeks my internet will become extremely slow. At times a page wont even load. After a few seconds to a minute or so it works fine for a few minutes then it seems to "hiccup" again. I am pretty sure it is my router because if I connect the modem directly to my PC it works like a charm. I have a fairly new router(less than 1 year old) and before 2 weeks ago this had never happened before. When it first happened I reset the router for a few minutes and it has worked since so I thought it just needed a reset but it has happened again tonight.

Anyone know anything I can do to make sure it is the router and any fix? thanks!