Self-Ejecting Internal HD - MBP

Hi guys.

I´m Having issues with my 2010 13" Macbook Pro 7,1.

I made the OWC Data Doubler mod almost 1.5 years ago.

Since the mod everything has been running butterly smooth.

Disks:

OS : OWC ELECTRA 6g 128Gb SSD

MEDIA: WD Scorpio Black 750Gb 7200RPM HD

Once i installed Mavericks the WD Disk started to self eject everytime... i reformated both disks.. reinstalled mavericks via thumbdrive (CleanInstall) and the problem still persist.

I thought the problem was the disk... so i mounted it on a external enclosure and ran a backup... it ran pefectly.

So. My other guess was the SATA Cable on the macbook pro. i order one vía iFixit with another HD just in case...

Any ideas what can be the cause of the problem??

If the SATA connector does not work what should i do??

(Sorry for my english)