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CMM stuttering during linear open scans

Hello,

Wondering if someone can help me. I amusing a star probe to scan a cylinder with a linear open. The probe seems to intermittently "stutter" during the scan and reports an error for workpiece lost contact. Wondering if anyone has had this issue and has any idea what might cause it.

The other thing is it seems to happen more in the morning after being unused all night but by the afternoon the problem largely clears up. Wondering if it is possibly something mechanical.

Thanks
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