I have just done what Ketron told me to, after I got all new boards and new HD. They loaded OS3 from factory and then I was told to update to 4.1A. I have checked all connectors. It was just the same with the original HD, and first SB second SB and now third SB. Before changing the parts I tried reloading OS starting from OS2.0.(told by AJ). Still the same. The worst is that these issues appears randomly. Never know when. Could this be some bad cable connector? Thought Ketron was interested in finding the fault, not so sure anymore.
This year is when I really need a US vacation. You never know Frank, may be a free lunch for you