503 Error website disappears when i upgrade to PHP 8.1

Now the site is coming up.
No idea how that corrected.
Any input?

Hello,

All our themes work with PHP 8.1. Actually, our demo site wpdemo.hotjoomlatemplates.com/academy is based on PHP 8.2.

So, after switching the PHP version, the error message was probably temporary until all the modules for the new PHP version are loaded.

Regards,
Milos