LP gas Leak Detector won't shut off

Hi has anyone had a issue with their LP gas detector and how is it maintained etc. Mine went off at 10pm last night and i pressed the mute button and it stopped and a minute later came back on. I shut the gas off at the tank and opened the coach windows like the book said but it still continued to beep. The red light came on and not the orange(fault) and i put a fan in front of it and it stoped for the night. It came on again this morning so i disconnected it and took it appart and blew it out and ran a Q tip in and around it.I don't know if i should replace it as i have not hooked it back up yet.Paul..