1. Sometimes, when I tap on an icon, the indicator light shows up (a glow around the icon), but the app itself does not open. Then, if i tap on it repeatedly, nothing happens. I can temporarily fix this problem by opening up the recent/opened apps list (holding home button) and clearing everything (or clicking on that app if it had been opened). Once cleared, I can tap it again and it would open. As you might see, this can get very annoying and troublesome after doing it so many times. Is there anyway I can permanently fix this so that I don't need to keep clearing the open apps list?
2. Sometimes, when I unlock my screen, exit an app, press the home button, or clear the opened app list (as mentioned above), my wallpaper changes to an app. The app is usually random and sometimes is not one that I had opened. For example, the background of my messaging app or Astro File Manager would show up even if I had not recently opened it at all. I can also temporarily fix this by clearing the recent/opened apps list (as mentioned in #1). After clearing this, the wallpaper resets. Is there any way I can fix this permanently as well?
3. Snapchat and VSCO Cam constantly "stop unexpectedly". I don't know if this is a firmware or incompatibility issue, but it usually works fine. This message pops up once in a while and isn't too burdensome, but is still quite annoying.
Thank you for all the help in advance. I am trying to get the most out of my phone and appreciate any help.