This happened in my house, too, although my house isnt new.
The fix was to use photoelectric smoke alarms. Most people have ionizing ones. I replaced my alarms, and it went away. Ionizing ones can detect things that are similar to smoke but definitely aren’t, and some of those things aren’t visible.
Yeah exactly. Combos have to trigger if either goes off, because otherwise they’d be objectively worse than an individual unit, so they don’t help with false alarms.
Just photoelectric did it for me, no more false alarms.