lane departure function comes and goes. Module replaced twice. Now navigation is coming and going.

What is your question?

Nothing but problems with this Cadillac. All electrical. Side mirrors stopped returning to position after reverse. Fixed. Back door locked and would not open. Fixed. 46,000 miles on it now. Will get rid of it as soon as I can afford to. Any answer as to why navigation comes and goes and what the fix is? Dealership seems to know nothing.