@freemangordon
So general problem is known and old: flashing kernel make battery machinery unstable until battery is physically reset (full charging cycle), and during that unstability weirdest bugs happen. On other side having to do full battery reset once reflash is small payoff for ability to use both VDD properly (you did it - nokia failed).

@pali
Funny - you did your best to make people find it - it's in first post. Still people happens to be unable to find it. However N900 is for geeks, even a geek can be dumb for a while (no offence to arnoldux personally).