My 13" macbook pro 2012 freezes totally every now and then

I bought my mac aproximately 1 year ago, and now it has started to act wierd. After using it in like 5 minutes, parts of the screen suddenly flashes green and proceed to a status of freezing. i can't move the mouse or do any kind of type-commands. the only thing that helps is to hold down the powerbutton until it turns off. when i have started it again it does the same thing over again. Do anyone know of this problem, and maybe have a solution, or just an idea of how to solve this problem? please help me :/
- right after buying it i changed the RAM to 8 gigabyte, but haven't had any trouble with it.
and also sorry for my - probably - not so good english

I ran the short and long hardware tests this afternoon and nothing came up. So there's no detectable hardware defect.
At the moment I don't suspect the drive. Today I've been running iostat in a terminal the whole day and I see no change in disk activity (or system load or anything else for that matter) when the freeze occurs. iostat keeps reporting the same numbers the whole time. Maybe it's something on the mainboard or a driver/OS X issue. Or an interrupt issue since everything that I did during the freeze gets done instantly after the systems starts responding again.
Monday I'm going to call Apple to report all of this. Since Apple Support only heard of this issue from you I expect I'm going to get a replacement MacBook Pro. But I suspect that there's a good chance I'll be getting another model with same issue.
A friend of mine has ordered the same configuration as I have at the same time. She hasn't experienced any problems so far. She's going to pay close attention to her MacBook tomorrow when she boots it in the morning. And in a couple of days we're going to test them side by side. I'll keep you posted.
Greets,
Kick

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