I got my Hawk Pen in Wednesday. Ran it about half an hour that day. Was off yesterday but put about 6 hours on it today grinding out work with the quickness. Started my last tattoo of the night on the apprentice, ran two lines and the Pen went down. Could tell the motor was still running, but the drive bar was staying retracted 100% of the time.
So, I have 15+ years machinist and maintenance experience prior to my tattoo career, mostly working with tolerances of +/- .0005 inches. I also run a small CNC shop here at the house. Figured I would take the guy apart and see what happened. SO here's the deal:

The drive bar mechanism is wonderful. I am astonished at the engineering of it, and with my past experience I would not change a thing about it.
But obviously the problem is deeper than that.
The working mechanism is three pieces, I will call them disc, bearing and offset shaft. The offset shaft is essentially a piece of rod with a hole drilled at an angle through it to set it at an angle to the motor's spindle. It is pressed into the bearing and the two of them into the disc. This assembly is also nice and I would not change a thing about it.
Now the issue, the offset shaft is simply pressed onto the motor spindle. When put under any duress it will spin freely on the spindle as there is no set screw, breaching, keys or anything to prevent it from slipping. After measuring the motor's spindle and the hole in the offset shaft it is apparent that the tolerance is not tight enough to hold up over time and pressure. There are a couple solutions to this problem, one of which I am going to test tomorrow and see how well it holds up. This is something any user can do given the correct instructions which I will post if it is effective enough to put my name on. The other option will require some machining on my end and would not be possible for most users as it is micro machining.

I will update you all as I experiment a little in solving this issue permanently. I personally feel Cheyenne engineers dropped the ball on this one. It is a great machine, lines and handles well, but if it doesn't hold up, well....its trash.