Triggers suddenly fail with "cluster instance is not linked yet"

We have 1 trigger on each of our collections and 80% of them suddenly failed with error:

“cluster instance is not linked yet”

They could not be restarted automatically. We received the “A Trigger has failed and cannot be restarted” emails about them. We were able to restart them manually in the Atlas UI. These triggers have been running for over a year without interruption and never have we seen this error before. This is concerning because we were not performing any actions at the time and it seems to have happened completely spontaneously.

Nothing is coming up in searches on this error or what the cause is. We are worried it will happen again.

Is anyone aware of what this could be?