Seemingly random errors in Nextcloud installation

I’ve been using owncloud for several years. When the Nextcloud fork happened, I upgraded to the first version on top of my previous owncloud installation. I’ve been upgrading Nextcloud as the new versions have come out. It has been working just great. Even this morning it was fine. Now seemingly, out of the blue, when I go to my nextcloud site I’m getting this error:

Internal Server Error

The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report. More details can be found in the server log.

I have no idea why. I’m installed on linux hosting with cpanel. My hosting provider observed that there is no database info on the config.php file in the config folder. I have been using mysql though since my owncloud installation.

Any help would be most appreciated, I really don’t want to have to start over from scratch.

check data/owncloud.log and your apache error log