Well, I'm not sure on what's causing it. If it IS a bug of some sort... you do know that you could report him for exploiting it. Though while in a PvP zone you can't complain when someone attacks you... if he knows you dc and still comes after you. That's also harassment.
I doubt it would get fixed asap if it isn't the problem with reinstalling. It's probably best to report this issue to a CSR or something.
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