spindle spinning speed goes over 10'000 r/min I get message no tool in spindel and machine turns power off. This same problem appears shometimes lower spining speed. ("Control on" starts mashine and it is redy when axes is reseted)

It is not good that galss loses suction and tool stops in it and I can't use small tools that requires more than 10'000r/min.

I think there is shome sensor failure or tool clamp is worn.

Anyone knows what can be done if spindle clamp is worn or if the sensor replaceable?