When was the last time you changed the batteries? I’ve had this and swapping in new batteries was the fix. I tested the old batteries on a cheap-o tester and they all read as good when I took them out… But sure enough, new batteries was the fix for me.
Smoke Detector False Alarms?
My house is pretty new, 5 years old. It has interconnected smoke alarms in every room (11), as required. I believe they are all First Alert brand....