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Maybe it's taken on a life of its own. I have smoke alarms like you described in the bedrooms & hallway, don't know if they're the same brand or not. One problem I've had intermittently is them going off mostly in the middle of the night of course. It seems like the contact between the 9V battery & the alarm gets weak (for lack of a better term) and the alarm thinks it needs changing. Part of the problem is they don't chirp, they just go off, and when one starts, it sets off the others. At first I thought it was weak or dead batteries, but after I tested a couple, they tested what looked like a full charge. I found out if I remove the battery and reinsert it, it works fine after that (until it happens with another one). I figure that reestablishes a good contact between the battery and the alarm.
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Marv Evans
'69 911E
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