I was crusing some old posts on the NewellClassics web site when I came across a posting to check your CB connections as they may come loose after 20 years of use.

So out came the nut driver and almost 1/2 of mine needed snugging up. Don't know if I cured anything, but sure didn't hurt anything either.

When I was playing plant manager one of the annual projects was to check the connections in motor control centers with a heat gun. If there was heat, and usually there was, we would then go though it the following down time and tighten all the lugs.
Same for your house panel!