The blue plastic type screw post are not capable to carry the rated board amperage for long periods and have arc burned the B+ and phase A header pins many times, melting the plastic around the header stake pin holes. The 36 volts B+ has 10 amp in line fuse which has never blown. I dislike this kind of wimpy wiping pin array system, opting for the robust screw terminals of the drv-8301 & Hercules 570ls3137 control card when a combo deal without an expensive QEI sensored motor ever becomes a reality.
Many times was aware of a very distinct soft snapping sound in RDK, a clue something was wrong but didn't put it together until seeing an blue arc and later became aware of running motor on 2 phases only. First believed snapping sound the MOS bridge or ADC shunt resistors having broken solder joints which might have moved onward after hitting the shunts with new solder. Admit pushing this RDK to the edge though never over 350 watts.
To fix headers: Carefully remove the entire blue block screw array prying it upward from the metal header pins soldered through the PCB. Relocate any burned 3 screw blocks, slide them apart in threes & rotate any burned header pins 90 degrees. Some of this issue stems from cold solder joints on top board under plastic header strapping & finding holes not fully plated through from bottom of PCB or the copper plating burned through to bottom of PCB rendering solder on the bottom non-functional. In that case pry the header strapping upward to expose the cold solder joints of individual pins to copper clad soldering the top side of pins to PCB, that fixes everything.
