When my Samsung S3 battery gets down to 20-15%, the phone becomes unusable. The signal goes completely and the phone screen starts flickering. As soon as that starts, I watch the battery go down from 20% to 1% and die within minutes.
I've only had the phone for 4 months, and it is still under warranty. But I don't want to send it away to be fixed and be phoneless if I can help it. The phone is running the latest software. And I have done antivirus checks and nothing seems to be the problem.
The battery lasts perfectly fine until it gets to around 20% - 15%. Any ideas on what I can do to stop it from happening? Is it the battery or the phone itself?