Based on your explanation, it would seem you just ended up with a drive that failed. I too am having some major troubles getting a machine dialed in, so, I had just scoured old messages for other discussions about the Automation Technologies drivers.
What I found is that anyone having drive failures appeared to have gotten their drives replaced with new ones, and then the discussion ends. Given that the company sells a whole lot of different components and assembled kits for various machines, they must be working for people because there are not very many complaints that I can find.
In my case, my KL-8060 seems to behave, but my KL-6050's act like the signals I am sending them are terrible when I know the signals are clean. I've been thru every possible ground loop and power supply test / rework and still can not find the issue. Until I do, my machine is going to have to sit... It's only been 3 years with this one, so another year probably won't matter lol.... I get the feeling I will have to order two drives from a competing firm to trouble shoot with as I do not have anything spare on the shelf. This is the first real stumper I had in 20 or so retrofits, but the first time I am using these drives.
I too have pending questions sent in via email to A/T and have not yet heard back from them. Hopefully you will be contacted and can just exchange your 8060. You'll perhaps know more when you swap it out with a new one.