MBP unib. 17" shut down instead of sleeping (also when plugging magsafe)

Hi All!
I've this problem.
When i get the system message that the battery is running out and i wait for it to discharge sometimes the MPB just shut down without apparently sleep, but when i turn it on the screen shows it went in hibernation.
Other times it goes and still in safe sleep but when i plug the magsafe it shut down immediately and i have to reboot it from hibernation every time.
Is there any way to fix this myself or i have to send it to support?
ty
jw

eww wrote:
Calibrate your battery and see whether that makes a difference:
http://support.apple.com/kb/HT1490
I tried but apparently nothing happened.
the calibration steps are:
_Plug in the power adapter and fully charge your PowerBook's battery until the light ring or LED on the power adapter plug changes to green and the onscreen meter in the menu bar indicates that the battery is fully charged._
_Allow the battery to rest in the fully charged state for at least two hours. You may use your computer during this time as long as the adapter is plugged in._
_Disconnect the power adapter while the computer still on and start running the computer off battery power. You may use your computer during this time. When your battery gets low, the low battery warning dialog appears on the screen._
_At this point, save your work. Continue to use your computer; when the battery gets very low, the computer will automatically go to sleep._
*At this point my macbook saves ram on disk for hibernation and shuts down itself imediatly after. Or in best cases it stays in a "can't wake" sleep for an hour or two and if i plug magsafe while in this state it shuts down...*
*Anyway i also did the last 2 steps:*
_Turn off the computer or allow it to sleep for five hours or more._
_Connect the power adapter and leave it connected until the battery is fully charged again._
And again, when i leave the mac on battery power after the warning dialog the insane behavior occurs every time.
Can't figure out why my battery seems not to handle the 5 hour forced sleep it should.

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