@talios -- can you please post the results of the TRACEROUTE command, with Google as the target? Do one immediately after the restart, and one after the "skyrocket" event.
Also, please do another trace for www.canucks.com and for www.rangers.com -- two quite-different paths.
I doubt that resetting your cable-modem will do anything, except for the "hop" between your cable-modem and the Shaw router in your city/town -- all the other "hops" should not be not affected by a restart of your customer-provided equipment. It would be a "strange" network if restarting one customer's modem affected the performance of the entirety of Shaw's infrastructure, or Shaw's interconnections to other networks.
A pothole on your street should not affect traffic on the Trans-Canada Highway #1 in a different province. 🙂