Have a loud banging sound in water system.?

Approx. once or twice and hour there is a loud banging sound that comes from the home water line. This occurs when a faucet is turned on or toilet is flushed but sometimes just occurs on it's own. The pressure reducing valve is set at 60 psi. We have no idea if this is water hammer or something else. Any help or advice would greatly be appreciated, this is driving us crazy. Thank for your help.

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