I have had this problem on my Sam A70 over a few months and have read numerous, restart, clean the contacts, change the charger articles... Then one said turn the phone over and press quite hard 1/2 an inch above the Samsung logo. To my amazement it worked - again just a few moments ago. I don't know why. It may reseat the battery, move contacts slightly to clean them? At least it moved me forward, allowed me to keep the phone - and this may help in a permanent solution...?