I think thats a common problem with most long running shows. It starts off normal enough, with logical plots but as time goes on the writers need to come up with new and better stuff to keep people watching. A lot of the really great shows out there were great because they had an end in mind and actually ended. They wrote in a way that drove the story towards that ending. The never ending shows like soap operas/dramas don’t have that option so they have to get crazy with the story. Disclaimer: ive never watched soap operas personally.