Does the engine crank when hot?

I assume it does. Older cars with carburetors could vapor lock when hot. This is where the fuel turns to vapor in the fuel line. Cars and trucks these days (like yours) are made with fuel injection with high pressure fuel pumps. They are far less likely to vapor lock, but not impossible if there is a problem with the pump or with the regulator.

I would first start with checking the error codes. The vehicle's computer will store error codes even if the engine light does not illuminate. You can have a parts place like Autozone scan the codes for free. Different scanners will download different levels of detail. If this doesn't work, you may need to have mechanic with a better code reader. You can always ask the mechanic if they have the ability to read a greater level of detail than a place like Autozone before you take your vehicle to the mechanic.

I recommend checking the fault codes first. That is the easiest and cheapest step. If no fault codes are present. You can pull the spark plugs to see if they are exceptionally dirty or if one is different than the others. That would give you indication of a fuel problem or a dirty injector. Next have the fuel pressure checked to rule out fuel problems. A mechanic can perform this test. If that is good, then I recommend a mechanic to troubleshoot the issue. There would likely be a sensor that is reporting within spec but not functioning with the correct output when hot. For instance the coolant temperature could be reporting a cold engine when hot which affects the computer's fuel/ignition map. Fuel injectors could be dirty, or an ignition coil could be malfunctioning when hot. Air flow sensor and crank position sensor could be faulty. Given that there are many things that could cause this, a mechanic may be needed to troubleshoot the issue if no codes are present.

Generally, the dealership will be much more expensive than a independent mechanic. If you need a mechanic, you can ask your local parts place for a recommendation.