Probably about 2 days ago my car said a door was OPEN when driving. Put the car in park and reshut the door that was the issue. Now today my car alarm goes off intermittently? I also noticed that when i hit the unlock button the horn will sound like it locking?? Any idea??
I’d bet the switch on the door in question is making intermittent contact (its going bad) and fooling the car into thinking the door is open or you are stealing it. It should be easy to replace.