I have an iPhone 5s. I have the most up to date ios9. I can have my phone plugged in make a 20 minute phone call and lose 3%. Battery on standby without usage may last 6 hours. This all started about 2 weeks ago. I tried to restore, when I start the process. I et an error message in iTunes that says. "there was a problem downloading the software for the iPhone, The requested resource was not found" Does anyone have any solution for either problem?