We wired a house about 3 yrs ago, and this customer called and said his smoke detectors will just go off in the middle of the night for no apparent reason. It doesn't happen constantly but every few months. He's changed a few but the problem still exists. I think he's got about 7. Haven't looked at it yet but going friday, just wondering if anybodys come across this problem before b/c I know we haven't.