Random Macbook Shutdown

Alright so heres the problem,
my macbook randomly shuts down in the middle of doing my stuff like surfing the web.
i found out that leave the charger on the thing would make it stop doing that, but when its off after a few min or so it slides down a message that says to hold my power button to restart my mac.
this gets annoying all the time and i cant go downstairs to go watch tv w/o my charger.
is this because of the new update issued or is my mac crazy?

That message is a Kernel Panic. Have you added any After Market RAM (Memory) at all? Defective Ram is a big cause of Kernel Panics. Have you upgraded to OSX 10.4.10? Some users are getting Kernel Panics using Airport (Wireless) when running off Battery since the update.

nope havent added any ram, and yup, ever since i upgraded to 10.4.10

yeah lots of people have had kernel panics due to the new update.