ios 12.4.8 battery drain on iPhone 6+
My iPhone 6+ will suddenly go from full (90%) to empty in seconds. This is random but only happens when I am using the device. With light use the battery lasts for days. if i use Facebook, or download an app it sometimes just dies and i have to charge it ( shows 2%).when using the device it starts going slow and i know that it is about to die again. This started immediately after upgrading to ios 12.4.8
iPhone 6 Plus