Annoying issue with my cnc router

[TECNC]

Good Day All,

Sorry If this is in thr wrong section.

I have a home built CNC router running mach 3. Was built in 2011.

Long story short.... Left machine running a finishing pass on some vacuum forming molds came back once finished and the spindle was sitting very randomly spinning in a none natrul way. https://youtube.com/shorts/OUIfTT_EAKI

Parts I have changed thus far....

A new pmdx 126 and 107 board have been fitted.

If any one can shed any light onto this i will be greatful as you all know, Its an expesive table if its not cutting.

Thank you in advance

regards Tom

[Clive S]

Have you checked for a broken connection at the spindle or somewhere along the cable where it gets a lot of flex

[TECNC]

If i had enabled the spindle and it was doing that i would understand wiring but thats only just enabling Mach 3 before its referenced,

[m_c]

What actually switches on/tells the VFD to power the spindle?
BOB output? via a relay? MODbus? ??

[TECNC]

I have a PMDX 126 (BOB) then a PMDX 107 options card that controls the VFD