Flash a full stock firmware with Odin, boot into recovery and factory reset. Check for any error messages in recovery then test.
It sounds like a partition corrupted, hopefully not permanently damaging the emmc chip.
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Note: This quote doesn't automatically apply to everyone, decide for yourself if it might apply to you.
Originally Posted by justruss
What has this place become?
It's essentially a few people graciously answering the same repeating of immature, lazy, demanding questions from the masses.
Nobody searches. Nobody reads the first posts or titles of threads. Nobody even looks at posts a couple above their own.