[MrForbes]

The spec sheet for the terminal blocks suggests tightening the screws that hold the wires in, to 17 to 35 lb-in torque. That's a lot of torque to apply with a slot screwdriver! Maybe what's needed is to make sure someone with strong hands tightens the connections.

Also double check the wires are stripped the minimum 5/8" length.

Having a checklist to double check the tightness of the screws before competition, is a good idea.