Hello, I live in a home built new in 2002. Not always, but on occassion a wall switch will make a loud popping noise when turned on. I have noticed this with more than one switch through out the home. It doesnt happen continiously, but when it does its makes you take notice. Its not horribly loud, but a distinct pop. I assume it is current jumping the circuit before contact is made, is that right? Is it safe?