A "Good Ground" can be significant to many problems.

Look over your ground wires for good metallic solid frame connects.

 

Thanks. We shall see what the dealer comes up with.

 

I can tell you what the "dealer" will come up with, it will be how to get as much out of your wallet for simple and unnecessary stuff as possible.

 

Easily $2k+,without correcting the actual cause.

 

Dealership huh? You didn't tell us you like to throw money away!
My best guess is the dealer will get you for a 2 hour "diagnostic fee", then a BCM & Programming first (most expensive first @ a dealer), then who knows what they will try, try, try...