Out of nowhere while on knoxraid my phone wouldn't charge unless completely turned off like something within the ROM was acting up so I downloaded and installed a new ROM I think it's called purerom but I'm still having the same problem when I get home today I might try going stock and seeing if it's a hardware problem but just wanted to see if anyone was having the same problem ..
I had a similar issue to what your experiencing on the stock rom. Clean the charging port on the phone by blowing air into it. Then check your charger to make sure you have no dust in it then try it charging again.
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I have 2 chargers from Samsung that work perfectly fine for my brothers phone he also has a note 3 and I cleaned the port with can of air and still only works when I first turn on the phone and charge it the first time if I try to plug it back up it won't see it and when it's completely off
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