Hi

If I press the g and h keys at the same time, the phone powers off. If I press any key and then the e key shortly after that, it powers off. If I open and close the keyboard sometimes it shuts down.
Occasionally, pressing only one key will cause this.
As far as I can tell, it's only the keyboard keys that cause this, and some shutdown's are a lot more reliable than others, G-H is a certainty.

It isn't a clean shutdown though. It's as if the power has just been cut. The screen goes out line by line, the same as powering off an old game boy.
This happened a few weeks ago with another n900. The usb port fell out of that one, and I was charging the battery using a regular lipo charger.
That phone was replaced with this one, the only thing that is the same is the battery and sim card.

Needless to say, this makes the phone very hard to use
I have reflashed the phone already, although I don't believe that this is software related, as I can power it off the very moment it boots, in fact, with the G-H kill combination depressed, I can't even power it on at all.

Thanks