fastcgi_pass keeps getting reset

[Applepie]

Hello,

I have this strange bug that sadly brings my websites down (which can be at the most unfortunate timing) where suddenly the line where fastcgi_pass is, in the

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/home/USER/conf/web/DOMAIN.com.nginx.ssl.conf

gets completely reset.
Instead of

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fastcgi_pass    unix:/var/run/php-DOMAIN.com.sock;

It suddenly gets changed to

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fastcgi_pass ;

Any idea what could possibly cause this?

Thanks in advance!