Motu 828 Mk1 & Sleep/Wakeup problem

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I use a Powerbook 867mhz with a Motu 828 mk1. Everytime I shut the Powerbook's lid to send it to sleep with Live and Motu running, and open it again later, Live wont give a sound unless I close and re-start it. It works well with other apps such as iTunes. Anyone know what the matter is here?