BSOD on start up every 4 or 5 days - Toshiba laptop 3 mths old

Hi, I get the BSOD on a Toshiba Tecra R950 Laptop and need help interpreting the dump file. I cannot recreate the blue screen at will. It only happens when I start the machine up some mornings. I've read it will get worse so I should do something about it while I am still in warranty. The shop where I bought it from says they can't fix unless they can replicate the problem. Is this...