Well,

Bought the N900 at Regent Street last Thrusday and the reboots started as soon as I switched on the device. Didn't install any software and it seemed to be random no matter what application I used.

4 days later went back to the store and asked for a replacement which they were happy to provide. Played with it at the store for about an hour and...

AMAZING!! Not a single reboot so far and believe me when I say that I did what I could to stress the device.

I think that coming from a faulty N900 this replacement made me appreciate the device even more. My advice, if you purchase the N900 in the store, get it replaced! no point on flashing the device, etc. For the rest of you, I have been told that an update is due for Dec,29th