Rotarius, yes, the connectors make a big difference. Simply 'refreshing' your connections by plugging 'n unplugging can make a difference. But it's definitely not all there is to the PC phenomenon.
That may be the case, I am not an electrical guy so I don't really ridicule someone else's opinion. Now some of the mumbo-jumbo I read on a'gon on vibration control, that makes me laugh at times.