I have an issue with my adaptive fast charging. When turn fast charging is turned on, I noticed that when I plug in my charger there is a little notification that says "adaptive fast charging". But on 2 occasions after using allcast app and my battery level was around 10-20%, it no longer "fast" charges. I've reset, turned off the phone, power saving turned off, and still not luck. After 4 hours charging my battery level is only at 80%. I've reset my phone already to factory, but still took a couple of times unplugging and plugging the charger to get the "fast" charging to work again. It was charging fine until yesterday again. Any thoughts?