On my P900, occasionally when the phone rings, pressing the numerical
keys to answer/reject doesn't work. It seems like the keyboard is
locked, and didn't unlock.

Manually trying to unlock the phone doesn't seem to work either.

I havn't really played with the jog dial to see if that still works yet.

This has happened a few times, and doesn't seem to go away until the
phone is switched off and on.

Anyone else seeing this? I havn't reset the phone completely yet (it's
only a couple of weeks old), and havn't really put anything new on the
phone except Bluetooth Car, Opera, file viewers etc (definately nothing
not available from S/E CD or website).