*We have a
maintainance policy for inside the house. *Could this problem be due
to mice chewing wires? *If so is there a danger? -- Worried

The mice are the ones to worry... the voltage on the wires is around
75 Volts, DC, on an open line, IIRC. Enough to get their attention,
but NOT a fire hazard, as the current is limited in the local loop.

Since you do have a contract, now is the time to call the. You might
check -- are ALL interior jacks giving trouble, or just one or two? If
only one, check for loose wire, just tighten them down a tad.