I have a 2014 infiniti q50s 3.7 with 35,000 miles, it all started when i was coming to a stop i was braking hard then the car just stalled out, i start it back up no issue put it in
drive and go, as im driving it around its idling rough or just stalling out when coming to a stop or put in gear. So 2 days later i start the car up and drive it 15 min to the dealer and the cars perfectly fine no stalling no rough idling, dealer says its throwing no codes and the cars not acting up so i drive it home on the highway cruising at 80 and the cars fine all the powers there and everything then 20 min later i come to a stop and its rough idling. Also in park and neutral its fine and when this issue started the front camera will randomly come on and not come off when driving. Car shifts fine and responds as it should with pedal input. Any ideas of what it can be at 35,000 miles its at the point where it just stalls when put in gear.

Car never gave me an issue except for the direct adaptive steering which was solved, car was running great and everything no issues at all until i was braking hard and it just stalled

No idea as it's only happening occasionally and not throwing codes. If the car idles/rev's fine and only stalls when put in drive it could be anything from the MAF to the fuel pump relay and quite a few things in-between. Have you made a video of the problem happening so the dealership can reference it?

I had a similar problem long story short needed a transmission was told the sungear had started breaking off