Issue in multi-site setup (content randomly disappearing) randomly during day Frontend | IIS , 21 Sites 1 umbraco instance v13

Questions
1
  1. The content still exists in the backoffice.
  2. Re-saving and publishing that corrupt nodes categories/designations makes it reappear on the frontend dissapears the next day
  3. There are no relevant errors in the logs.
  4. The issue is not consistently reproducible.
  5. It’s client work, so we can’t record exact reproduction steps.

the workaround solution was we re added those nodes and it works but this is second time we got this issue, first one was banner now, its categories / designations