I'm behind two further updates to my phone A12 bcoz I thought it will add more permanent additional files to my ROM storage and sometimes I experienced it some lagging when I use it prolonged then recently I charged my phone after two hours with fast charging mode I surprised that my phone didn't charge! I thought it maybe some troublesome in my adaptor that I might almost destroy and check it! Or maybe a broken wire in my cable charger so I test it to another adaptor charger from other smartphone but it works! Then I decided to replace my samsung charger until then when I try to update my A12 with two updates, after that, I tried charging with my samsung adaptor charger, luckily it works back now fully functionate! Now I learn better to be updated in Samsung OS for a smooth and convenient to use.