AC Fast Charging Stopped Working After AT&T Update Dec 11th

I had my Samsung Note 4 for about 2 months now and the AC Fast Charging worked great! 100% in a hour. But after a updated on Dec 11th from at&t might have caused this to stopped working. After the update I took out my phone from the charger in the morning then at night I tried charging it again but it was really slow. I looked in the battery settings and the fast charging checkbox was greyed out. This is a problem...it now takes about 2 - 3 hours for a full charge. If anyone is experiencing this problem please help.