Working formula stops working without any change on our part

Hi,
We have a field with a complex formula that has worked perfectly.
When I logged in again today, I found it not working with a long list of errors. We have not changed anything on our part.
This happened before a few months ago.
Any idea what could make a working formula stop working without it being changed?
Thanks.

Hi @Mary-Lou! To help you better, we need more details about your Baserow usage and formula. Could you please answer these questions:

  1. Are you using our SaaS version (Baserow.io) or running Baserow on your own (self-hosting)?
  2. What is the formula that is not working anymore?
  3. What recent changes were made to the database or these particular tables? Have you changed any data that is linked or used in lookups for this formula?