Quote Originally Posted by Tom Aylwin View Post
Hi Clive,
Someone told me perhaps the heat was affecting the grease in the sliding / screw mechanisms - changing its consistency - and causing a momentary stall, hence mother board losing itself??

My instinct is it doesnt get that hot but I'm a woodworker, not a metal engineer!!
Ok I personally would not go down the route of changing the MB until I had checked out the mechanics.
You mention that the spindle collet get hot and clamps get warm. Have you tried running the machine without the spindle running (doing fresh air cuts) and then see if the machine loses position?.
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You really need to give more info and a clear description of the problem you are having. ..Clive