Hi, i have a 3 year old modem and my internet has just starting playing up with the speed going really slow for like 30 secends then goes back to normal for like a min then repeats. I called my isp and told them about my problem. They did some tests, and after doing all there solutions like fact reset, change filter, its still not fixed. So they came up with buying a new modem, so my question is how do i test if i need a new modem? btw my connection is wired and im the only one using the internet at my house.