Purchased a 6 yr old house with a Nutone intercom/remote speakers/door chime system. There are: three IS 335 remote speaker/intercom/radio units; three door bells, each with a different chime (entrance door bell has a two-way speaker); and, a master IM 3303 unit. Other than relatively poor radio reception the system works; but, the different chimes go off by themselves at odd times dring the day and night. What to do? What to do?

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