The issue has been found after testing by users, but theres no solution yet.
The thrown error is: "Error: Uncaught (in promise): UnknownError: Connection to Indexed Database server lost. Refresh the page to try again",
This error is referencing to this already reported bug: https://bugs.webkit.org/show_bug.cgi?id=197050
Somehow it also tells, that with iOS 17.4.X this issue has been increased much more, because before we didn't have this kind of issue.