Logic Board replaced after randomly shutting down

I know there are a lot of posts on the randomly shutting down issue...
My MacBook started randomly shutting down after a month since I got it. Apple replaced the logic board and I got it back today. I read on some posts that people got their logic boards replaced and the problem continued. Is this likely to happen with my MacBook?
This seems to be a big issue. My friend got a MacBook last week and it started randomly shutting off within the first hour of use. He had it exchanged, and it's fine now... but for how long?

I don't think it would do any good to yell at the store manager/technician. Still, I do understand you since I got the same problem here. However, since my logic board was replaced, I got fewer RSD, which is a start...
Personnaly, I know that my MB is guaranted 1 year, so I won't hesitate to have it repaired, or exchanged if needed (after 3 repairs for the same problem usually). As a matter of fact, other than some RSD, my fan has started making noises when I power up my MB, when it is cool. I wait because there is no solution out there yet (for RSD, and my problems are not that bad.
By the way, reading many of the threads around here, we can almost state for sure that:
-the logic board
-the RAM
-the hard drive
-the heat sink
-the battery
are not the (direct) sources of RSD. This has to be proved for the processor and the fan.
To be followed...

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fxmBoston-
Greetings and welcome to the Apple boards.
Miriam is right. Take it back and have it repaired correctly. We have good consumer laws in MA so they have three chances to get it repaired correctly or they owe you a refund or a new machine.
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