Hello,
as I say, this is only 6 months old so I guess I can get it fixed but every time I try and use on my knee it cuts out and the computer prompts me to reboot in safe mode.
First thing that comes to mind is overheating - the term laptop is a misnomer since the unit should not be used on your lap. A flat hard surface is best which will allow adequate airflow to the heatsink/fan - blocking the bottom vents will cause the computer to overheat. You may want to look into a laptop cooler like this one which can easily be used on your lap. http/www.newegg.com/Product/Product.aspx?Item=N82E16834997737
just something to consider if wanting to use the laptop on your lap