Since you've checked all of your screens (incl. where city water hooks up?), the only ideas I can come up with are either:
your pressure regulator is going bad (but since pump pressure is same...)
a leak somewhere or low point drain leaking
or, your valve to select whether city water inlet goes to lines or fills your freshwater might not be fully closed (or has some debris keeping it from fully closing).
Hopefully someone else has some ideas.
edit to add - when not using city water, does the pump run continuously with no faucets open, or come on from time to time?
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2012 Keystone Vantage 32FLS
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