Personally I would not be dealing with a dealer 3 hours (one way?) away for a new car with a 4 year factory warranty … I would probably establish a relationship with a closer Lincoln dealership to service my Navigator.
My 2018 Black Label ( first year for the current model ) spent many days over several trips replacing one of the headlight assemblies multiple times before they figured out that the headlight assembly with it’s computer was not the issue but a headlight control module (computer) elsewhere on the network. My dealer is about 20 miles plus the Black Label includes free valet pickup and delivery with loaner during warrenty period made the situation very tolerable. During the first couple of months I also had them address misalignment of side panel on console and fastener/alignment of one of the wheel well shields.
I have had new cars with very few issues but the more complex the vehicle and if it’s first year for ‘all’ new version I expect more issues. Today all vehicles are all a rolling local network of dozens of computers creating, in many cases, misleading symptoms which can cause several trips to the dealership to resolve.
You said your seat stopped working. You may want to check it’s fuse (would be quick easy fix if that is the problem and a new fuse doesn’t blow too)
These are my thoughts & comments, but not knowing your specific situation, location etc thy be completely or partly off point.
I’m sure once you resolve your current issues you are going to really enjoy your new ride.