[Skyrider]

So, for the past few weeks or so, my ping has been going up from 50 to around 300-400. This happens randomly, and can last from as little as a few minutes up to a few hours.

I'm not too sure how to go about finding what the problem is, does anyone have any suggestions?

EDIT:I do know it's not because other people are using the Internet at the same time.

Have you attempted to set up your Internet Connection within steam options (downloads + cloud) to Cable/Fiber > 10M?. Last time it was set to modem 56k for me, and it caused a huge lag.