Sorry just seen this, I think it's aftermarket. Not sure if it had a factory system before.I've seen some hack jobs with aftermarket alarm wiring. Does your car not have a factory system? Seems like the wrong car has a mind of its own.
Well, it's better to have some sort of alarm working in case for insurance purposes. If something happened, it'll be the first question, if you had it set or no alarm at all. Thus making your cover invalid.With the random issues I wouldn't be surprised if the wiring has been messed up!
But it's a solid low mileage car so well worth sorting.