Hi @PAlexanderF,
If the issue doesn't occur on local, we suggest you increase the allocated memory on the server where you are running the application.
Also, please enable the cache in QloApps.
To enable cache refer to the screenshot: https://webkul.chatwhizz.com/share/screenshot/66c74ff089f0970bda1fce63
Although we haven't encountered this issue before.
If the issue persists, please consider creating a ticket at https://support.uvdesk.com/en/customer/create-ticket/ so that our team can assist you.