[Help] Z3 slow internal memory speed.

I don't know what happened, but in the last few days, my internal memory got so slow that i have to wait like 15 second for the applications list in Settings/Apps. Also, it takes 20 minutes to simply move a 200mb file from a folder to another. I have no clue about the cause. These 2 things were istantaneous before I had this issue, and I have no idea if it's either a software or an hardware problem. I would like to know some ideas on how to solve it before trying a reset.

I'm on Android 5.1.1, rooted.
Sorry for my English.

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