Late to this sorry - I had similar problems when I removed mains power or had a mains turn off. My internal power supply was knackered, and I simply replaced with a unit of higher quality, and all works fine now.
I suspect you're sorted by now though, but if not, you may wish to try that.
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John
theMouthPiece | RADIAS Demos | Cubase Studio 4 | Dell P4 2G RAM | Virus TI | Korg RADIAS | Korg KARMA | Absynth | Reason | KLC | Electribe EMX1 | Boss DR880
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