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X axis error (0x9) Reset E-Stop Button

Good morning,
My company has a DEA Swift A000 manual (very old machine). It's a bit of time that frequently, when the operator move the X-axis, Pc-dmis shows a pop-up window with this note: X axis error (0x9) Reset E-Stop Button. The biggest problem is that he has to close the file on which he's working to reset the program. I've searched a lot on the forum and on the manual of the pc-dmis, but not found a similar problem. Someone can help me?
TIP: the DEA machine has been dismounted to be cleaned in the past. The problem appeared after the cleaning.
Thank you for your help