[Richard]

Just to add a little armchair, hindsight, now I see, engineering to this issue. The problem is exacerbated by the fact that the wiring connected to the terminals is either 12 or 14g solid wire, meaning it is stiff. Any vibration in the wiring is going to transmit to the terminal and onto the solder joint.

A solution could be to use what is commonly referred to as hook up wire, very flexible multi strand wire of the same gauge. You could either just splice it, or install an electrical terminal board with the solid into the terminal strip and the hook up wire between the strip and the board.

I like the euro style with protected screws. https://www.amazon.com/dp/B085W3RGPR/ref...asin_1_img

Or the standby. https://www.amazon.com/ALUM-COPPR-3PORT1...281&sr=1-3