Hello David,
I came here for the same problem, my Z motors started vibrating during a print, and now they invert direction randomly. Checked the wires and everything seems fine, switched to different motors and the problem persists.
Unfortunately my board is a bit more… weathered, so it may not pass a warranty check
Do you offer paid repairs also?

Late to the party, but if you have an Android phone you can use the Fing app to find out the address of all the devices on your network

So, I want to heat my P3Steel's chamber. Right now the "chamber" is simply a cube that encloses the whole printer, electronics and all (except the PSU). Without active heating it gets to 35°C, I'd like to get it to 45-50°C for more difficult filaments, but is dangerous for the Duet Wifi? I have a fan on it.