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It could be a wiring issue, but I would guess the key is to blame. Just went through a comfort access diag for my trunk not opening. They replaced the trunk access antenna (behind the rear bumper) and the CA module. Also, brand new Varta key fob battery from the dealership. No difference. For your passenger door issue, the exterior door handle houses all of the CA electronics and antenna for that zone. Aside from wiring, or a cell phone being permanently lodged in your door and transmitting, I don't see what else could be to blame. I would say a new key is your next stop.
I am going to replace mine if it bothers me enough with the hope it fixes it, but I just deal with it for now.
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