Never tick the re-partition option, it can brick your phone.
For your issues I would first recommend a factory reset from inside rom - settings, accounts. This will format internal sd card so backup your data to external sd.
If still the same then download the full GML2 rom from sammobile, check md5 then flash using odin. Follow the instructions in the official rom thread (general forum) exactly.
In each case test before you restore/install any apps or mods.
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.