sdcard fails no reason sdcard cannot format cannot wirte or formatted

I’ve a Sandisk 64gb class 10 microsd that used to work fine. All of a sudden it has become read-only. I can read all files, but I cannot delete the files is come back to sd card again add any files or format the sdcard in Android, linux or windows.

Every attempt to format sdcard fails (with 10+ tools I tried) on PC (including gparted, fdsik, etc).

Micro-sd has no read-only switch. Is this hardware problem? 

sounds like it is write protected. hardware problem. it would need to be replaced.