IFP-1000 Double Address

Have intermittent trouble beeping with 2 duct smoke detectors. Can silence but comes back minutes later OR will go away for days then start up again. Can ignore it and will go back to normal on its own. Driving us crazy.
One says MISSING the other DBL ADDR.
My question: For the DBL ADDR can I change the address thru the panel? Or does It have to be done at the sensor?
We found a loose wire on the MISSING , fixed it but only lasted for a few days.
Can I bypass or disable temporarily until find problem or replace?
Thanks, Mike

The “missing” device is causing that fault. Replace it.