i have problem with my HUANYANG 4.0 KW INVERTER VFD when i do the job it stops randomly.feels like spindle haven't power. rpm 24000 400hz but still it stops when cuting wood with 11.2mm end mill tool at 10mm depth. strange is that it dosen't get hot but a little bit warm.

i have this set https://www.youtube.com/watch?v=_R6AMpZV7VU&list=HL1396214050

same look spindel. air cooling.