I remeber having some issues when I first attemped running a Nextcloud Docker container years ago. I don't know it it was because it was one of my first times with Docker or if it was Nextcloud that was screwing-up, but a native (non Docker) install solved all my problems. Was rock-solid ever since, up when I retired it recently due to unrelated reasons.
Maintaining a server can be a pita, and not upgrading frequently is both a security risk as well as problematic from a stability pov.
My recommendation would be to use our All-in-One docker image. It takes care of updates and is supremely easy to use, plus likely to bring nice performance benefits as it has all this stuff that makes it fast like the HPB for Files.
