Blizzard's firewall is blocking your ping/ICMP at 63.240.161.189. It's nothing new... been that way for a while.

Something that may need to be looked at though is what is going on around 70.143.193.136, where you had a time-out and then two 23ms responses in the same trace. That means the response time went from 2000ms+ down to 23ms in the space of 3 ping requests (that's a swing from 2 seconds or more, down to 0.023 seconds).

That's an AT&T segment... SE can't do much about AT&T's routing and/or maintenance plans. Need to get with their Tier3 guys and have them look into things.