Macbook loses contact with OD server after wake

So, as the title states, I have a macbook on the lan that is connected via airport to an OD master. Problem is when I wake it up from a sleep it can no longer connect to the server. If I go into Directory Utility it shows "trying to connect to server" which eventually fails. The only way to reintroduce it to the server is to either restart or delete and reconfigure the server in DU. So far I have not found an error in the log files on either the server or the macbook....

Oh, if it were only that easy!
Nope, double checked and it is set up correctly. However, I might be inclined to think it might be a bug with wireless connections... Not sure how the server could tell the difference but worth a thought.

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