I have 5 interconnected 110V smoke alarms, 5 years old (Firex, if that makes
any difference). At least one is randomly (but very infrequently) going off
for a short period ranging from a fraction of a second to one or two
seconds. I have only observed it at night (sleeping, naturally) but that is
not too surprising given that during the day we are in the house less. This
happened for the first time a couple of years ago and then twice in the last
two days. Of course, all of the alarms go off so it is not possible to
identify one of them. Obviously I could disable the interconnects but this
will likely not help since the alarm period is so brief and infrequent, at
least up to now.

Have other people had this experience?

Is Firex a known piece of ****?

Right now I am probably going to just replace all 5 alarms. I know that
power glitches can cause this sort of behavior, but the only times I have
noticed it in association with glitches, there was a definite blackout.
Light-dimming and blinking episodes have not previously caused any trouble,
and the current crop of alarms was not associated with any visible glitch.

Help!