content: Good to know this is a problem with others as well! My husband and I were awakened a week ago to the alarms all going off @ 3 AM. We never could figure out what happened and thought maybe it was a power surge. Then last night, at the same time, it occurred again. Only this time, an hour later it again went off and then again another 10 minutes later. Our solution: temporarily turn off the suckers @ the electrial box AND remove the batteries. We air-blasted and shook the one that was the culprit and a TINY spider dropped out. It was miniscule!! We have since cleaned ALL of the detectors AND once again replaced the batteries. Based on the other descriptions I am NOT holding out hope. It is worth my sanity to replace them all. I hope the manufacturer reads all of these reviews!!!!