Look at the physical position of the doorlock - the orientation of the key.
If you get the lock cylinder stuck in lock or unlock, then move the lock stem, it will do the same thing. It will only click, or altogether stop responding.

When I lock or unlock my car doors, I make sure that when I unlock the car, the key is perpendicular to the ground. When it's in the right spot, the locks twitch a little.
I too re-wrapped the doorlock wiring with electrical tape. I also found it helpful to put some superglue on the exposed wiring I couldn't reach with tape just where the wires enter the plastic part that holds the contact for the lock/unlock sensor/switch.

Before I did all this, closing the door would move the wires around. I had fun a few times unlocking the car about 20 times and having it lock itself again and vice a versa.

Hope this helps,
Will

PS A bent key or a new key that isn't cut juuust right makes this a lot more likely.