Hello,
First of all, thank you for your purchase.
This sounds like a weird issue, does anyone else have access to the admin part of your site? Could have it happened that you saved settings in the plugin from 2 sides? If this is not the case, did you change settings in it frequently? Or only did an initial setup and afterwards the only major thing happened was the WordPress update? Any detail on this is appreciated, so I can find the cause of this issue.
Regarding auto running of the plugin, it seems you have an issue with wp_cron on your site, which is used by WordPress to automatically run scheduled runs of plugins and code. I suggest you replace wp_cron with server side cron, this will fix this issue. Please check details on how to do this, here: https://themeisle.com/blog/disable-wp-cron/
Regards, Szabi – CodeRevolution.