Why functions.php file automatically empty?

In many WordPress websites functions.php file is automatically erased. I checked every file. I scanned files on server but no file is infected. After an interval of time website response white page, when I checked functions.php it empty. Why this is happening. Is it a server problem?

Topic hacked Wordpress

Category Web

1
answered at

As far as I can think of this is a server issue. This has happened to me once due to server crash.

I hope you have a backup of your files.

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