Andrea,
When I worked at JEOL, we had a 733 with the Noran pre-amps and SamX software.
Usually the issue was noise on the cables to the pre-amps. Wiggling them usually returned them to normal.
But I did find on more than one occasion that the SamX hardware/software was the culprit. Might try shutting down the software and cycling the hardware.

Sent by Mr. "T"

> On Oct 1, 2017, at 8:17 AM, Andrea Orlando <[log in to unmask]> wrote:
> 
> Mines

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