I confronted a weird battery problem. Before this problem started, my nexus 5's screen was flickering. I researched and the flex cable was the reason of problem. I replaced it with a new one. Now my led light colors has changed. This can be acceptable but there is one big problem. Whenever I charged the phone fully, and plug it out, using some apps and whenever I use social media apps such as Instagram, Twitter, screen freezes and sometimes it reboots itself. Always this problem occurs when charge is over %60. However, when it is under %60 everything works normal. And when I plug in charge, it also freezes for a while. It's been approximately 3 years and 8 months since I bought it. Is it battery problem or else? What do you suggest?