Occasionally at night my 21 f150 brake lights and front lights start blinking on and off. The screen on the inside lights up with no image and the buttons under the screen light up. Locking and unlocking doesn't change anything. Dealer can't find anything wrong. Anyone else have this issue?

 

That would happen to me when I was connected to a trailer. Haven't towed in months.

 

Are you sure this isn't zone lighting coming on and turning off when you walk in and out of range with the key fob?

 

It's the courtesy lighting detecting your smart key, most likely.