I have been told that the Coincident IC needs 500 hours of break in. That is over 20 days of continual use. This sounds quite extreme. I have had my tuner on since friday evening (it is now Tuesday afternoon) and I can't help but feel guilty!
Cables "wear out" over time probably because your connectors and jacks are getting dirty. Also, the surfaces of the conductors oxidize and the metal loses conductivity over a long period of time. But this takes years, not months.
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