My Pegasus R6 was delivered last week and I started transferring some 6TB as well as a full TimeMachine backup of my laptop (380GB). I left it running over night and sat next to is for the last few hunderd GB, to my alarm my laptop crashed, very unusual, I restarted and did the remaining 2-300 GB with rsync. Again to my alarm the drive suddenly dissapeared again, this happened several times. I kicked it off again and left it running over lunch, came back and it had finished, as I sat down to check it, it dissapeared again.
So, off the Google, after a few minutes I arrived here, to cut a long story short I can confirm that it is my iPhone, a UK (GSM) 4S that's killing it. While testing I managed to completely kill my laptop (top spec 17 inch, SSD etc.) and can disconnect the drive within seconds if I send myself a text with the phone near the cable.
I've no bothered to test whether it's the cable or the drive unit yet but with my phone on the other side of the laptop (right hand side) away from the cable it's been fine, move it to the left, near the cable, and it dies instantly as soon as I get a text or a call.
Very happy with the drive, I was about to send it back but now that I know what it is I can avoid the sitiation. I will probably contact Apple next week and get them to replace the cables with something with better shielding.
-John-