Magento 2 index Disappears

Our Algolia Index disappears. This has happened to us 3 times now. In the past we have re-indexed the whole site manually 10 at a time. This time it is not working. They are not getting indexed to the categories. see here, our records drop off at around 9 am. Monitoring%20%20%20Algolia

Just want to understand why it happens and how to prevent it.

This has now happened close to 9-10 times now. We aren’t sure why the indices are being removed.