Dciw

Hello. I’m new to the forum. Can anyone help? my 2007 pathfinder (my pride and joy) has started requiring me to randomly unlock it from the passenger side and then silence the alarm with the fob. Normally it works fine from the fob or the door buttons but then it randomly stops working. Once unlocked it goes back to working again for a while. I’ve changed batteries etc but I am out of ideas. Thank you