Asus 5z Internal Memory running out of space

I have updated my 5z to latest version, I found one bug, internal storage space running out without any app download. Factory reset several times but same issue arises again. Please do needful.
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Strange issue... M not facing
I am facing the same issue.. 64 GB of memory gets occupied with in few days after each reset and phone starts mis behaving. Dis you get any solution vrajupadhayay09???
Same issue... Did you get any solution?? I have reset my phone many times but this problem doesn't go.
Same issue with me as well..is there any solution for that??