After more occurrences of strange characters, I can summarize for myself: - it occurs completely randomly (it is enough to edit one character in the file and damage will occur) - it's not related to the clipboard (I won't use it in the file and it will get corrupted anyway) - in my case it only happens in PHP and CSS files (but rather exceptionally there) - e.g. TXT, SQL or JS files (but I open JS less) have never been damaged - in both PHP and CSS, strange characters almost always appear at the beginning/end of the block (where there is a bracket } or {) and maybe only once they appeared at the very beginning of the file.
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