LaCie d2 thunderbolt series hard drive reliability

I am considering purchasing a LaCie d2 Thunderbolt series hard drive for my Time Machine backups for our household.  We have two MBPs, one is running OS X Yosemite, the other is running OS X Mavericks.
I have read a few older reviews noting that the LaCie drive keeps dismounting during Time Machine backups.
Has this continued to be a problem?

Ryan,
Check drive volume name and also the Computer name. Apple released a tech note recommending that both be limited to only the characters A-Za-z0-9 (no dashes, hyphens, or other special characters.
If you can, send the Apple System Profiler report to me at the addres in my profile. Imay be able to see something there. I have helped another user with similar problems, but with a LaCie USB drive. He got things working by repeating the recommended steps, and double checking everything.
As others have rported, this should work, so there may be something else preventing proper operation.
If the drive is usable from Finder, but Time Machine cannot use it, there is something related in how Time Machine is viewing the drive.
Mike

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    Mahalo nui loa (Thank you very much)

    Aloha,
    It was a long week. Here is an update.
    Had the opportunity to go to the Apple Store yesterday and purchase new thunderbolt cables, and hooked everything up this morning.
    I disconnected the Seagate drive from the sled, and brushed the contacts.
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    I very much appreciate your thoughts and time, And I look forward to your thoughts, To include any experience in getting the data off of the Seagate. It contains seven years worth of photographs, which I would hate to lose. I also got the message about redundant backups. There may be some of the backup in Crash Plan.
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