My god , It is a Samsung thing! I have several Android devices two of which are the Samsung Galaxy S6 and S5. the only devices I have that do this irritating default app now chosen thing that this whole blog is about is Samsung. I like an app called "TvPortal" this app allows you to steam internet TV shows to a Chrome cast. works great but sometimes there is lag and stutter so bad you cant watch it. when that happens I have another app that will stream download that show for later viewing.with every other device it works like a charm, I get the option of "always" or :just once". with Samsung, when I on the choice of steam content to tv. I get the choice of several different apps. But once I choose the app I want to use It says" Thank you for choosing the default app"`I HATE THAT!! Now if I want to down load a bad and laggy mirror site, I have to reset ALL app preferences each and everything I choose a different app. It is like " you stupid Americans, you cant handle choice" I believe that this issue is soo damn irritating it will be the game changer for me. Very un user friendly, I will never give another cent to Samsung. I will vote with my dollar, samsung phones are great quality and workmanship(for the most part) it is the "apple like philosophy' THAT I DETEST! I also refuse to purchase CORSAIR computer components because of the horrendous customer /tech support I recieved,