Yes Mate more than likely a dodgy door sensor. Mine had one when I bought it and the alarm was driving me nuts so I disconnected it !!!!!!!!! Cheers Deano
I don't think a semi will give the same results
dont know whether yours is factory fit or aftermarket, but my toad full closure alarm kept going off after 5 minutes without fail. turned out to be the interior light switch set to constantly off! since i flicked it back to normal position its been fine