Default applications auto resetting

Hi I've got this problem since the very beginning after I have purchased my note 4. Well basically all the default applications keep resetting themselves so every couple of days when I choose link,it keeps asking me which browser I want to use. Which application I want to use for videos,for youtube etc.
This is not caused by installing new apps.
Anyone had this problem?

Galaxy s4 unable to update applications

Hello all, tried searching the forum but I'm posting from my mobile device, galaxy s4. So after months of having to clear cache to make room for application updates, finally I'm no longer able to install updates due to lack of internal memory. I've moved all available apps to internal storage and cleared cache every time. Is there a simple solution to enable my apps to remain up to date? Sorry if I'm posting in the wrong area. Looking for help. Thanks in advance.