"Intermittent hardware should be treated as hazardous waste,
and disposed of immediately" - Mike Warot
This is a hard learned lesson... from somewhere around 1997... not sure of the exact date. The fact that a given piece of hardware sometimes works causes you to chase it with time and energy... which will, of course, eventually be found to be a waste.
The exception is if you have the technical facilities, skill and time to repair the part down to the component level, which most of us don't.