Earthing is a good point; I’ve not seen any earth strap anywhere, but I’ll have a look thru the electrical drawings and see where one should/could go (unless you know where a Triac would have been earthed?)

After advise, I found a setting within Win10 that reduces power to USBs after a period, so having disabled the function I’m hoping that’s cracked that issue.

I’ve got a usb isolator fitted, but don’t think I’ve got a shielded cable. Will check that out.

Not quite sure on the e-stop issue… hopefully after a good nights sleep, the machine will want to play tomorrow ������