Reson analysis : these phenomena occur, generally disable the detector for some time, andforgot to remove the battery, the battery is long-term slow-discharge actions. Remedy:1, replacement of new battery 2, note that the battery compartment battery leakage and pollution, such as pollution, must cleaning promptly, if not the battery will to buckle or circuit board corrosion damage. 3,Available pure alcohol cleaning or special electronic to cleaning .