Although I don't know the code, I have to assume each zone is its own process, its own world. When you zone there is a call made by your current zone to some kind of central switchboard and that makes the call to the next zone, handing off to it your player object and telling the new zone which zone line you're crossing and where on that line you're crossing.
For some reason, your client isn't receiving the response from the new zone, and so your client sits waiting for the response timeout, which I'd guess is 60 seconds.
Lots of things can cause that from code/data issues to all sorts of network problems. Frequently when you see either perfect success or total failure, that indicates one server in a pool is in a bad state but the rest are fine, but for some reason the bad one is still passing the LTM's health check, so it's luck of the draw whether you hit the bad one.
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