it's on a shared folder, office fully updates, windows fully update, it happens to a partner on the office but, he was able to fix only formatting the computer.
I try also, File/options/trust center click on trust center settings, protected view and disable all the boxes and doesn't work.
I have permissions to save, but I can't.
I disable the antivirus an doesn't work.
Sometimes that I opened i'm able to edit the files, sometimes not.