Writing right on SD card is gone

Hi,

since few days i have a problem : i can not write on my sdcard.
when i'm deleting files, they reappear few minutes later, and when creating files they disappear...
i tried to format sd card from my phone it's not working.
I still can read data on SD card.

i checked the etc/permission/platform.xml file, and here what i have :



















I've read internet that it is not good ?
But it was working few days ago and for few months...
My phone is not rooted, and I don't have access to a computer to do it.
What can I do ?

Thank you

Phone is a XT1068 running Android 5.0.2 stock and SD card is a sandisk 32go.

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