I bought mt S4 in August last year. The device perse works great. The usb charger plug on the phone seems to be loose. Sometimes I have to wiggle the cord plug until i hear the charging beeping.And even thou it says is charging the % indicator goes down I have to either restart de the phone or remove the battery and reinsert it. And latetly that is not fixing the problem. Two nights ago i had to close all apps and left it overnight because even thought it ws saying it was charging it wasn't and when i woke up it didn't have 100% charge althought it was charging. Today even though it was connected to the charger was 100% and when I moved the phone it beeped like if it was connected to the charger and as i move the phone it was getting connected and disconnected (phone was beeping) and the charge strarted to go down even thouthe lifghtning bolt was on the battery icon. I left it alone and when I returned several hourd later the phone was back to
100%.