From my understanding that model is not the best. I can not tell you of the specific problems they are having. But I know of a company that has 4 or 5 of them. They are constantly down for all sorts of reasons both fanuc and control related problems. A lot of unknown bugs that are hard to troubleshoot as well. I know it doesn't help you now but the newer model?? Can't remember what model but it is much more reliable.
What kinds of problems are you having?