Morning everyone. I keep having my smoke alarms sound in the middle of the night when we are all sleeping. They sound for 10-20 seconds then shut off. I have 3 First Alert BRK SC7010B (smoke and carbon monoxide) and 4 BRK Brands 9120B.
I have changed all the batteries within the last 30 days.
I have 2x standalone carbon monoxide detectors that have not sounded. I have even purchased 2 more BRK Brands 9120B and swapped out alarms after they sounded to see if I can single out an alarm, but this still keeps happening.
How can I troubleshoot what is causing the alarm better?
Edit: all alarms are less than 3 years old.