I have a Cincinnati Sabre 750 and it is giving us intermittant 15901 SPDL ORN FAIL. It only does it on certian tools (ones used to Rough out metal). It has done it on different programs that we have used for years, on stainless steel & aluminum. After it roughs out the metal it puts the tool back then will alarm sometimes, most times and all the time. The operators have shut the machine off for 5 or so min and it will be fine. What could it be? Spindle getting too warm ? have touched and it or the tool dosent feel warm.

Thanks for any and all help! Dan