Maybe best to call into the dealership if it persists.
Electronic Dashboard Lacking
Mine was lagging when I picked it up. Once I got it home and connected it to the home Wi-Fi it began automatically downloading the latest Sync 3.4 update. It took a number of days to download and install as I was on and off the drive so much. The lag continued throughout this process, until one day last week I fired the car up and the display looked different. Lo and behold, the lag had gone, in fact the response of the system was quite fast. So go into your settings and the automatic updates, and check whether there’s a download or installation going on in the background. Hope this helps.
Ford Puma Titanium 1.0 125 Ecoboost. All Options (exc. sunroof). Grey Matter.