No obvious pattern in this. Can go a week or two with no issues then I get BSODs every day sometimes 3 and 4 in a day. It has happened once while asleep overnight too. Only just begun photographing the BSODs UNABLE TO UPLOAD PHOTOS FORGET I ASKED. No idea why this is happening, I've checked with Windows that all drivers are up to date. Don't know what to do. Today when it started up again if failed to find OS ... so I switched it off again. It found it second time around. This is the first time it has done that.