Recently, I have noticed that when locking my 2015.5's doors using either of the rear door touchpads, they take longer to register and lock. The front doors react almost instantly when i rest my finger in the pad of the handle to lock. But after the locking using the rear door, i can quickly unlock and lock using the rear door without delay. Issue seems to only happen after a drive or longer periods of time. Is it normal that the front doors react quicker to locking than the rear? I will bring it the car in for a different concern and will ask the service advisor. Just want to hear your opinions. Thanks.