My driver's side door lock is acting up. I just installed new solenoids about 6 months ago and i know they work. At first i thought it was an issue with my key, but after taking apart the door today i know it's not the key. All of my linkages seem to be hooked up properly so i don't think it's that either. It's almost like the hinge inside the door that moves with the key and lock solenoid is freezing up. I've sprayed a liberal amount of liquid wrench on it and it works until the first time i use the key to unlock the door. Any idea what the issue could be?