Hi. Have a 2014 Impala 2LTZ with 35K miles. Other than recalls, not one issue until recently. This model has the passive door lock/unlock (button in middle of door handle) which I use a lot. Recently, it stopped working intermittently and then more intermittently and then stopped all together (lock or unlock) on both driver side doors. Passenger side doors work fine. I have a new battery in my main key fob and neither of my spare key fobs will do the trick either. I've played around with the system settings etc. and no luck. I can't find anything on the issue doing general searching and can't find what might be a replacement part on any parts sites. Any help appreciated and thanks in advance.