Apple Watch Ultra cellular not connecting unless hard reset

This has been a common error for some time for many users. When I first got my Ultra (Gen 1) I had no issues, until about 9 months ago. Now when I leave the range of either Wifi or my mobile, my Ultra does not connect to cellular unless I carry out a hard reset. Very annoying. I'm now running watchOS 11.2, however this has been occurring for some time with many previous watchOS.

Has anyone seen of a fix for this issue??

[Re-Titled by Moderator]