oh! and iv got problems with the GPS.. when in drive, or checking in.. it will detect where i am at first, but after a minute or so it gets confused on where i am and thinks im a few hundred kilometres away.. then nokia drive just sits there with the occasion of finding where i am, telling me to take next turn and then suddenly im all the way on woop woop again

whats wrong with my GPS?
the first time i used it it was fine.. but now its playng up