Hello All, we have a Mazak CNC vertical milling machine with a 640M controller on the machine. It was sitting for about a month and when I went to boot it up recently, it had a message: "M64GroupA.exe has generated errors and will be closed by Windows. You will need to restart the program." I called Mitsubishi and they recommended to change the battery out. There is a 3.6 volt battery that I changed out. They thought that because it was sitting that long that maybe that was the issue. I also the re-initialized the controller. This still didn't change any of the error messages. I put a new cloned hard drive in (we had one that we had already cloned). This still didn't solve the issue. After communicating back and forth with Mitsubishi, they now think it is a hardware problem. We have had two Mazak machines and have had repeated problems with hardware going out on the electrical side. I'm thinking of now sending the entire controller out to Mitsubishi and having the look over it and diagnose it. I hate to do this because it is always expensive. Has anyone ever seen this issue and recommend any solutions? Your help is greatly appreciated.