Everyone freezes on my screen during some fights?

Example video here:
http://www.twitch.tv/marnidawg/c/3091097

I can still cast spells and move, but it's like I'm not sending or recieving any data? I have a good connection (5 up 30 down cable with a constant good ping). Is this a server issue? If not is there anything on my end I can do to fix this? It seems very inconsistent but tends to happen mostly in the evenings my time (8-11pm cst).

Greetings,

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