Sync stops working randomly and cannot be restarted without new sync chain. (Bookmarks no longer syncing, send to device no longer working reliably either.)

[Veil]

Could this issue be linked with https://community.brave.com/t/lost-password-extensions-and-missing-history-from-brave-sync/542138?

I’m also having 504 error and im unable to restore my passwords, extensions etc,