I have had this on the charger basically all day except for a couple hours when I was away from home when it went from 50% charge to 20% just from turning it on and checking to see if an app would open.
I have deleted about 10 apps to see if it was a storage space issue, I have rebooted it multiple times. Only apps that will open and work (mostly) are google chrome and facebook messenger. The rest of my apps say they aren't responding or will freeze at start up. There is 4gb of space available so I don't know what is going on. It was working just fine yesterday. google keyboard is acting weird too when I am typing as well, like it can't keep up with me or something when it normally has no issues.