MBP Randomly Shutting Itself Off

Hey guys, I wanted to see if the community may be able to help me fix a problem my computer developed last week. At some point last week, I was lying in bed using my MBP when I accidentally knocked the backside against my knee. The computer then immediately went back, and wouldn't turn back on for a while. When it did turn back on, the fans were running in overdrive, but nothing happened on the screen. Realizing what had happened, I reset the SMC, and the computer turned back on and seemed to be working fine. Since then however, my computer has randomly shut itself off a number of times, seemingly for no reason. In addition, it will sometimes not recognize that the charger is plugged in at all. And after it does shut off randomly, booting up takes a very long time. Additionally, sometimes when closed and gone to sleep, waking it from sleep seems to initiate a system restore from last state, but then freezes halfway through the restore, and I'm forced to force shutdown, and restart. Is my laptop on its last legs? Or is my battery about to go, or what's the deal?
I own a 15" Mid 2010 MBP, 2.53 GHz Intel i5, 4GB memory, running Lion 10.7.5
Any help would be greatly appreciated! Thanks!

My new MacBook Pro is doing the same thing and I just bought it 11-22-11. I am new to mac, after years on a PC, and I have had mixed messages about whether to use the Mac plugged in once it is fully charged, or use it for hours on the batter and wait for it to run all the way down before charging. When I am fully charged and I am going to be at if for a long time, I find that the screen will go black like it has shut off, keyboard goes black to. Like the person before me asked, if I unplug the power cord from the Mac, the screen comes back. Hmmmm. Do I have a problem with the charger on my Mac? Thanks for helping this Newbee too!

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What does "About This Mac - More Info - Power - Battery"
What does that say. Esp cycle count.
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MBP Randomly Shutting Itself Off

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