this a solution ( i did it twice), but because I got startup problems with the nav screen since this afternoon, (takes about 45 secs before a screen comes up and no Mini logo), I visited my dealer. He explicitly warned me not to take above action as is could be harmful for the electronic circuit of your car. (has to do with charged condensators etc. )
I have been given this solution by my dealer and MINI UK. My dealer said that he would quite happily charge me £65 to do it for me but that is all they would do. They even gave me the printed instruction, from MINI Technical Manual.
why would they charge you £65 to do it? Surely your car is covered by the 5 year warranty like everyone elses? And this is a fault?
Weird dealer you have there
I did the reset myself a couple of times, but after having done it twice and the car being alright for a few months it started happening again, so it went in to the dealers and the Nav was found to need a new control box, been ok ever since, starts all correctly and doesn't drain the battery anymore