Hi and thank you for your message, I hope your day is going well!
I'm sorry for the issue faced, seems PHP has ended the free memory.
Have you tried to restart the server, if is possible?
You can maybe try to restart PHP and Apache service if you cannot restart the server.
The error seems caused by the slowdown of the server that you are mentioning.
Seems you are not using the latest updated UVdesk, I just inform you the latest version is of June 2023 and is 1.1.3
I suggest also to use an updated version of PHP, check here: https://www.php.net/supported-versions.php
Please let me know if restart the server, use an updated version of PHP and UVdesk help to resolve the issue.
Before wish my best luck I want remind you I'm not part of the UVdesk team.
Currently there is some weeks that UVdesk staff is no more present in the community, we hope and wait they can come back.
I'm not a developer so I just try to help with my limited knowledge.
I currently I'm using UVdesk on my small and personal website with no much traffic.
I'm not facing issues.
I'm running UVdesk 1.1.3 and PHP 8.3