I saw a loose neutral wire, one time. The lady had a socket in the
front room which didn't want to run the window AC. However, the socket
in the kitchen was OK, but that didn't cool the house as well.

I pulled the panel box open, and went to turn on the AC. She noticed
the sparking "up in the corner there". Tightened all the neutrals, and
found the one that was loose.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
..