Ok, this is odd. I cannot get a traceroute to any of the IP addresses in your Ping Plot. The first three are NAT addresses, which should not route, but the rest should route. It dies at 63.241.193.13 for me, which is only 2 hops out.
I'll file a trouble ticket, but you need to let your ISP know as well.
Would not surprise me if they came back and claimed it is iPhone users causing the problem. They seem to be blaming all thier network problems on the iPhone lately.