2007 Lincoln Mark LT - Unreliable starting

My 07 lincoln mark lt fail to start on me and leave me stress out stranded by starting whenever it wants to. At first it would start most of the time and once in a while it wiuld not start to where i have to wait for a few minutes to be able to start and now i will have to repeat this cycle most of the time to where i have to disconnect the battery to be able to start now. I took it to Lincoln dealer in my area but they couldn’t tell me what the problem is… I know theres alot if people iut there having this same problem too. Can somebody help me with problem? Thank you

Since your LT is actually a F150, you might have better success at a Ford dealership.
I am surprised you are not getting a check engine light.