Problem with New MBP 13"

I bought my daughter a new 13 inch MBP, the base model... 2.4 GHz, 250GB HD, 4GB RAM, a few weeks ago at Microcenter for her to use in High School.

Since buying the computer, there has been an occasional issue that, at this point is more an annoyance than anything else. Specifically, at random times while she is using it (just surfing the internet really) the screen turns black all of a sudden and it goes into a sort of hibernation/sleep mode when it shouldn't. It doesn't turn off and she's able to wake it from the sleep and continue using it. It does not happen all the time, but even one time is once too many for a brand new computer

I haven't taken it to Apple Store to look at yet because she's being resisting the possibility of losing it for even a day or two if we have to leave it there, but I know I have to before school starts.

Does anyone know from this description what the problem could be?

Thanks.

 

Thanks for your responses...

@TZRaceR6: I did as you suggested and found that the display sleep was set to about 1 minute.

I increased that so hopefully it was as simple as that to fix. The problem is that I've never seen it happen so I'm relying on what she tells me is happening.

@justaregularjoe: I also did as you suggested but she didn't enable Active Screen Corners.

Thanks again