Hey. I have a Galaxy Alpha and I really like it. I was messing with the settings. Then after a while the stock apps started to mess up.
1-For the S Health App. It would not let me take a photo anymore, and it has options like basic workout, distance goal, time goal. Well it got stuck on the distance goal of two miles so when I would be running the phone would tell me when I was halfway and almost done but I would just want it to be basic just tracking time and distance but not saying anything.
2-For the internet browser: I couldn't close tabs any more leading to a lot of tabs open, and whenever I click on the number at the corner that lets you know how many tabs are open, it would go blank like if it open the browser from scratch, but sure enough when I re opened it all the tabs would be there.
3- The Samsung keyboard would type in words but at times it wouldn't, it would show the word but not insert it. So I would slide or swipe the word again and once again it would just show the word but no put it in the text. This one I hated the most since I like sliding my finger across to type words; especially for short words like 'you' and 'going.' OMFG!!
SOLUTION FOR ME: well I just read this and kept seeing DEVELOPER OPTIONS as a solution. I did disable the developer options, and when I slide it back to on it said that it may cause errors in apps. So I left it off. And now on the INTERNET I CAN CLOSE AND ADD TABS

I feel confident it might have fixed the other two apps. Hopefully.
THANKS SO MUCH YOU GUYS!!