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Posts: 77 | Thanked: 160 times | Joined on Nov 2009 @ T.M.O
#20
Magnets near the N900 are known to wake up the device from sleep and mount/unmount the SD card.

https://bugs.maemo.org/show_bug.cgi?id=6689
https://bugs.maemo.org/show_bug.cgi?id=8235

I don't know if your holster could be causing the reboot problems though. But might as well give it a try