I finished a prototype that is almost working well. When I was testing it in production, it started working well, but after 2 or 3 minutes, when no key is pressed it still shows a random keypress on the LCD or the keypad freezes and I have to unplug and plug the electrical box again. I suspect it may be the keypad wires or any interference caused by the environment? The milling machine? I used 3 foot long wires for the keypad, I don't know if that can be an issue. Has anybody faced a similar issue with these components?