Note 4 ATT keeps locking up and restarting

Hey all, I've had my note 4 for almost 2 years now and its been running like a top up until a week ago. One morning when i woke up and the entire GUI was slow, even flipping pages would cause the phone to seize up and restarting. Also the reboots are painfully slow, sometimes taking 5 minutes to get from the Samsung galaxy logo to the home screen. Also when i go into the factory settings (power + up + home) it is really slow taking about 5 minutes. I thought it was my boot loader, so i flashed 5.1.1 from Odin and it still has the symptoms. Now i'm running 6.0.1 beta and the symptoms persist. I was reading that the SD card might be causing the issue and taking it out might help, its the only thing i haven't tried and i'm skeptical. I hope this isn't ATT way of trying to get me to buy a phone from them lol. Any help is appreciated! Thanks!

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