Hello @ttraband and everyone.
I found inside store room has bit problem with electricity, When I walked with
barefoot and go to store room, I start to test MPCNC and I touched metal case square of front the USB and I get little bit shock on my finger.
I put digital meter’s negative pin on top USB’s metal case and and I hold Positive pin with my hand, the meter showed me 105 Volt AC with small current output, that is mind blow.
The plug or main circuit breakers of store room don’t have an earth to protect from shock.
I realized that is big problem with CNC shield, i will call to Electricity Repair come to check.