MY MBP close session without any warning, is AC power and the only programs running usually are skype and safari

MY MBP is stand alone only with skype or safari running usually, suddenly close the session and i must reentry the password and start the session again, by the way any information unsaved is a completed lossl. The last year i changed the board in regard to the intel graphics card problem, but this problem is new from 1 o 2 monhs ago.
Some help is valuable.

Problem 1: Sounds like a bad adapter or bad DC-in card, or possibly a bad connection between the adapter and the card, or between the card and the rest of the computer's innards. Clean the contacts in the adapter plug and on the MBP and make sure they are securely and squarely connected. If that doesn't help, test using a different, known-good AC adapter. If that works fine, replace your adapter.
Problem 2: Run the Apple Hardware Test that you'll find (with instructions for using it) on one of the DVDs that came with your MBP. Look for an error report with "SNS" in it, indicating a faulty temperature sensor. When there's a bad sensor, the fan(s) operate at full blast all the time.
You could also just take the machine right back to where it was repaired and point out the problems that didn't exist before, but you will be better-prepared to do so if you've done this testing first.
Message was edited by: eww

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