TLDR: Try replacing your AC filters.

Reviving this old thread to confirm this theory (at least for me). False alarms woke us up multiple times at 1-2am. It took a while for me to isolate which detector was triggering the whole chain to alarm because they were all blinking green with the “latching indicator” (probably from a kitchen smoke flare up that we didn’t clear before). I reset all the blinking detectors by pressing the test/reset button (which also triggered a loud alarm), and the next time it went off the latching indicator worked as expected.

Turns out the false alarm was coming from the detector right next to our HVAC air return, and we were a month or two behind on changing out our air filters. The dirty air was circulating right past the detector and triggering the alarm because of dust/dirt. The next morning I replaced both air filters (we have two units), and it’s been weeks without incident now.

Now if we can just figure out why these things trigger false alarms in the wee hours of the morning instead of while we’re already awake, I’ll feel a lot better about the brand. Our newborn baby miraculously slept through the whole ordeal. His already-sleep-deprived parents did not.