Going a week between syncs isn’t ideal, but that still shouldn’t be happening.
The first thing I’d suggest is testing what happens when you open the laptop after a shorter time — try it after a day, or even after a few minutes. This will show if the length of time / number of changes is a factor. If it is, you’ll have a workaround until a proper solution can be found.
You can also try the troubleshooting steps in the Obsidian debugging guide. That might not be feasible if it takes a week for the problem to appear, but it will rule out various potential causes.
And you’re entitled to email [email protected] for direct support.