Join the club as far as frustration with dealers goes.
I realise the battery is not that old but when you return to the dealer ask them to test it as this problem along with many other technical glitches is often related to a defective battery.
A lot of functions in these cars rely on the battery being fully charged at all times in order for them to operate properly.
I totally agree with John. My start/stop quit working and I thought "COOL" I hate that thing anyway. Sometime after the car was due for service (the Works), after getting it back the s/s still wasn't working and I was happy they never noticed and fixed it. Mind you this S/S has not been working for at least a year at this point. Couple months after the "Works" service, I was sitting in the car with the radio on and a warning popped up "low battery start the engine", which I did and got home safely. I took it to the dealership and they spent over 3 hours testing before installing a new battery. As far as those "check marks" on the "works" list is concerned, remember this so called inspection was probably not performed by a fully licenced technician. In most, if not all situations, these service exercises are done by "minimum" wage people. At my dealership this person washes vehicles too. After a couple more bad experiences, I told the service manager that he wouldn't see my car again unless it was for warranty work. I got my reward when the owner of the dealership called me and long story short, others had complained as well and he fired the service manager and one service advisor. He asked me to come back to his dealership but I declined. I have a independent mechanic I trust much more than the dealership flunkies. I've never had a situation that required the attention of a licensed technician so I can't comment on their work ethic. In fact, my new mechanic actually used to work for this Ford dealership for several years. Bottom line, I don't give a "poop" how much I'm charged. What I INSIST on is TRUST.
I bought my first FE in 2013 and this one in 2017. In total I guess I've spent 80K$ (never traded in the 2013, gave it away), and never once have I ever been allowed (for insurance purposes) to see under MY dang car or watch while a service is being performed. If we are expected to sit idly by and drink free coffee and not watch what is being done to our very expensive vehicles then TRUST is the only thing that we can take comfort in. IMHO it doesn't matter how much the repair will cost. You need to find someone you trust and pay them whatever it takes to keep his business and his family viable.