My 2012 iMac 27" keeps ejecting my click free external hard drive after a few hours whether I'm using it or not

I've had my iMac since October 2012, and in November I got myself a clickfree 1tb external hard drive that uses Usb3...
My friend has the same hard drive and an iMac that's about a year older than mine, but has no problems with it.
However my iMac keeps ejecting the hard drive at random moments whether I'm using it or not, and it keep's prompting me
about the correct way to eject a hard drive... But I didn't tell it to eject the hard drive or want it to in the first place!?
It also doesn't always like to acknowledge that there is even a hard drive connected upto it...
My iMac also struggles to run any other programme if I have Final Cut 7 open either, it tends to just give up and freeze.
I have very little stored on the Mac itself as I store all my files on hard drives to keep the Mac clear and not clog it up, so
considering its running with a 3.1 GHz Intel Core i5 processor and 4GB memory, I'm struggling to see what's wrong with it...
Somebody help me please!?

Read the user manual and/or contact the vendor/manufacturer.  You need to determine first if the problem is the external drive or not since it's 3rd party. 

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