It seems every few months my wp-config.php is being overwritten to the wp-config-sample.php. Nothing else is corrupted or changed, just that. It started to do this early 2019. The host is Inmotion. I managed a dozen sites on Siteground and have never seen this issue before. The site in question uses Securi for malware protection and I have enabled files rights to 444 on wp-config.php. Of course it could be a plugin..