MM 2012 FD shuts down after day or less of working

After having fixed the FD to operate the MM it will shut down for no apparent reason showing the 'language box'.

I will re-start it and then this maybe happen again. I go to DU and it tells me to go to Recovery and use the DU there. This I did but near the end the print became 'red' telling me it cannot fix it.

This is after Apple replaced the SSD, the HDD and the Logic board.

I used the new DW which seemingly fixed everything but it went again.

I even re-installed Yosemite but eventually it fell again.

I would like point out that there is nothing on the MM except the basic system as I am very apprehensive to put anything on it because this has been going on for 9 months during which I have not have my computer and it stands to go to the Genius Bar{sic] for the 8th time!

I have even left in on overnight but have woken up to the computer running perfectly only to fall later in the day during use.

What could this possibly be since, as far as I know, the main components have been changed what else could go wrong?

BTW I am running 2 MM's and 2 MBP's in the house with no problems.

Thanx.

Safed