Your car alarm?
My car sits outside on the street and twice now cars have gone past that have rumbly exhausts and the alarm has gone off.Strange thing is,that trucks,tractors and buses go past regularly and they never seem to set it going.
Went off twice in half an hour one night thanks to a moth flittering around inside!!
Wondered if theres a setting in the MFD or somewhere that can increase/decrease or even deactivate the alarm system?