Stepcraft HF spindle cuts out on me.?

Hi there, if got the stepcraft microbe a little while now, im not a beginner to the cnc world. Bin there like a year or 15 now.
But still no wisdom can compete against you guys! The things i saw around here are really awsome! Puts me back in my corner to cry 😉
My issue is that i have a hf spindle from stepcraft that randomly cuts out when milling a piece. It just puts the frequentie at 0 once in a while! Just when i turn my back! A shame for the broken router bits and not good for the stress on the axes.! Does someone has the same issue or now wat the problem is? Thanx in advance! Put a picture of my latest creation!