External HD Not Working Yosemite

After I updated my Macbook Air to Yosemite, my 2T Lacie Porche Design External HD kept ejecting after a minute or so after being plugged in. I tried all the troubleshooting there is to try in this site. I took my macbook to an Apple store with the HD and was told the HD was faulty. Then took the HD to Best Buy and GeekSquad said they tried it in many devices and said the HD had no issues. So yesterday (as of the day of this post) I did reset on my mac to factory settings. It reverted back to Mavericks. I plugged in the HD and voila! No issues. So I thought that erasing everything on the mac might have solved the issue. Once again updated to Yosemite and boom. HD ejected. What's the next step?

I would contact the manufacturer and see if that have any ideas.
Ciao.

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