Recent Lag is on Comcast's end, what can we do?

I have been lagging nonstop for 3 days straight. I have made a forum post, and have talked to friends with Comcast/Xfinity Internet, and they have told me their connection has been running into problems as well. 

I recently got Xfinity internet about 2 weeks ago. My question is, has this happened before? Do we wait for the problem to be resolved by Comcast? Or are there any steps I could take to fix this myself? I really don't want to get stressed out over something that I believe is on Comcast's end which I can do nothing about, but I am definitely concerned because I am paying for a service that isn't performing like it should.