Strange Shutdown Issue

My Macbook has already been sent into repair once, it took them two weeks until I had a global search put on. My Macbook has been fine for the past 2 weeks, no shutdown problems whatsoever. However, recently, I've been having shutdowns like crazy.
Now, I mostly use my Macbook hooked up the AC adapter, and on my bed, because it hurts my back to sit in a chair all day, and if I'm going to sit, I might as well use my Mini.
However, I have just been using my Macbook (both in Boot Camp and in OS X) for over two hours on a hard tabletop. No shutdowns, no problems. I've played games, did some work, and just left it sitting for a while.
I've contact Apple Support, and they want me to send it back to the repair dock to take a look at it. However, I cannot afford to do this, as I bought the computer for school and I just started school yesterday. Being a week (he says, althought I'm sure it'll be more) or two without my Macbook will be devastating, as I will not have any way to organize myself as well as 4 out of 5 of my classes being computer based. I use my iSight to video my professors during lectures as well.
While on the bed, the Macbook would shut down cold. It's not a thermal issue. What could be causing the shutdowns on the bed or on my lap, as opposed to the tabletop?

I don't think there's anybody who can tell you WHY the shutdowns are happening.
I've contact Apple Support, and they want me to send it back to the repair
dock to take a look at it. However, I cannot afford to do this, as I bought
the computer for school and I just started school yesterday. Being a week
(he says, althought I'm sure it'll be more) or two without my Macbook will
be devastating, as I will not have any way to organize myself as well as 4
out of 5 of my classes being computer based. I use my iSight to video my
professors during lectures as well.
Two things:
1) How did you organize yourself before you got the Macbook? I suppose it shouldn't be too much of a stretch to go back to that method while your machine is away.
2) How on Earth are you using the built-in iSight to record your professors during lectures and using the machine at the same time? I would think it quite rude to be sitting with your back turned away from him/her while ducked to one side or the other.
If you don't want to send the thing in because there's just no way you could function in a university setting without it (I'm not sure there are too many universities out there that don't have some sort of computer facilities for their students but apparently you're at one), I guess you're going to be stuck in shutdown city until you get a grip enough to accept that you just may have to be "inconvenienced" for a bit by going to a lab elsewhere or using someone else's machine.
At any rate, I hope you get it fixed.

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Waiting for your prompt response.

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Urgent help needed; Database shutdown issues.

Urgent help needed; Database shutdown issues.
Hi all,
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wolfgang

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Hi,
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