Little big disk slow

Hi Forum
I purchased a little big disk 512 ssd for video editing
the unit works great with my laptop achives extreme speeds that i require for handling large projects (well usually 230 gbs per job usually 3 per month)
I recently upgraded to an imac late 2013 model (current model and i maxed out the optionals)
it uses the 3tb fusion drive tho
when i plug in the little big disk into my imac it mounts fine and i can read data fine - however i cannot write data to it at least not quickly it takes 6 hours to transfer 100gb compared to the 10 or so minutes using my laptop
the copy hangs appx every 50mb for about 30 seconds and then jumps up another 50mb (i can confirm the cable is not faulty as i get this result using 2 seperate cables)
i tried all the usual steps - restart - repaired disk permissions - even reset the pRam
i noticed after resetting the pRam that for the first 10 seconds i am able to use the drive normally and then if i have large files copying after about 10 seconds the problem shows again  and the copy hangs at the point it got up to (anything i copy in the first 10 seconds is super fast as the drive should be)
my theory and the support at lacie is that somhow the boot drive is interfering with the transfer - the lacie specialist suggests that since fusion drives arent very common yet and havent been tested there may be a conflict ...
i have tried copying from a daisychained thunderbolt drive directly to the new hdd and still experience the problem so i dont think it is a prblem with the internal drive
black magic disk speed test and it show a perfect working disk and gets files on and off it easily but not anything i want to copy will work
it soesnt matter the file mp3 or mov small or big the same problem happens
i have reconfigured the raid and reformated the drives with the laCie support
they think its a 100% normal functioning drive and that the problem is with my imac as the drive works on all other computers that i have tried
really im stumped and dont know what i should try next to get the hdd and my imac to become compatable
Can i get apple to diagnose it remotely
do they do that?

Hi there MSPoettl,
I updated to the new firmware for the 24' when it was released. This largely fixed the problem, although the Lacie's fan makes a very airy noise as it blows. The image on the 24' led apple careen is stable, so good news there. However when plugging the MBair into the Lacie and then into a 27' iMac I still get occasional distortion.
Good luck.
David

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