UpdraftPlus modifying wp-config.php?

Hi,
Your plugin is great. Thanks a lot.
On 2 different installations (same host) my wordpress sites went down this week (one on Saturday and one today Tuesday). For both sites I upgraded fairly recently to UpdraftPlus Version 1.9.64. For both sites I use the Google Drive backup feature (awesome!).
In both cases the site went down several minutes after the automated weekly backup. And in both cases the wp-config.php file was modified at that moment. A line of code was deleted:
require_once(ABSPATH . 'wp-settings.php');
I am the only administrator on this site and the only person who has FTP access. FTP logs confirmed that no one had connected. So my question is ‘can anyone see this as possible?’ I will wait a couple of days to update to the new version to see if this phenomena is reproduced this week. Thanks for your help.

https://wordpress.org/plugins/updraftplus/