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I use G-Mail.
There is nothing from LinuxCNC in my SPAM folder

I don't get notified about any of my topics, I always have to check manually.

rc.local would work, but not sure it is usable still on Debian, i know Mint stopped using it a while back, but it can still be made to work with a bit of fiddling.

Todd wrote:

Not sure if it will help much, but only connect your motor cable shield at the drive end. instead of both ends.

Sometimes it does help, a lot, although only once in my experience, the rest (probably over 10) both sides worked better.
All VFD's i have used have separate ground pins for mains and for motor, probably have some LC filter inside but i never checked, waiting for one of those to die so i can open it.
Another thing i noticed with a cheap 2.2KW HY-whatever VFD was that grounding the motor wires on both sides would make it possible to use it without mains grounding at all, hence the above assumption on LC filtering.

Otherwise in /etc/rc.local above "exit 0": sleep 10 && echo .....

Or "sudo crontab -e": @reboot sleep 10 && echo ......

The sleep is necessary with the orange pi at least.

Not sure if it will help much, but only connect your motor cable shield at the drive end. instead of both ends.