incorrect measure and Error message

Are you using a TP20 TP200? other sensor?  There's HALT, Debounce, and other delay strategies you can implement to reduce false triggers on the PI-200 probe sensor controller.  look through the renishaw site or this post i just made 2 days ago. Star probe stops in the middle of the program - PC-DMIS for CMMs - PC-DMIS - Nexus Community (hexagon.com)

however with this short and small of a probe, i'd be more concerned about your machine's drivetrain. 

--If it's creating false triggers while moving with a 2x40, there might be service needs for your belt drives, counterbalance (for z only), or drive motors.  Keep track of when the false triggers occur.  Is it doing it only when traversing in one axis on the machine?  If so, e-stop the machine, and push the machine on its air bearings to feel for vibration on the bridge.  If you feel vibration, start rooting the cause. 

First with the easy stuff, like cleaning and inspecting the bearing surfaces.

Sometimes it's something as simple as a belt needing tightened/tuned by an FSE to fix.  Other times a dry/cracking belt could be the cause, and more costly repairs might be a filing bearing, idler pulley, worn belt, or a failing DC Servomotor.

Are you using a TP20 TP200? other sensor?  There's HALT, Debounce, and other delay strategies you can implement to reduce false triggers on the PI-200 probe sensor controller.  look through the renishaw site or this post i just made 2 days ago. Star probe stops in the middle of the program - PC-DMIS for CMMs - PC-DMIS - Nexus Community (hexagon.com)

however with this short and small of a probe, i'd be more concerned about your machine's drivetrain. 

--If it's creating false triggers while moving with a 2x40, there might be service needs for your belt drives, counterbalance (for z only), or drive motors.  Keep track of when the false triggers occur.  Is it doing it only when traversing in one axis on the machine?  If so, e-stop the machine, and push the machine on its air bearings to feel for vibration on the bridge.  If you feel vibration, start rooting the cause. 

First with the easy stuff, like cleaning and inspecting the bearing surfaces.

Sometimes it's something as simple as a belt needing tightened/tuned by an FSE to fix.  Other times a dry/cracking belt could be the cause, and more costly repairs might be a filing bearing, idler pulley, worn belt, or a failing DC Servomotor.