LG G3 Android 6.0 update on 2/19, battery has been draining at 1% / minute. have tried: battery saver, battery doctor, cleared caches, dimmed screen brightness, no apps running in background, etc. etc. Phone is almost useless now and i'm ready to throw it out the window!! Went to Verizon store yesterday, but they were of no help, just kept loading 'battery saving' apps onto my phone -- none of which helped! Any advice???