My Validator Node stopped being a validating and became a Full Node. The Staking status changed from Active to Rotating.
The team alluded to the fact that since there is a limit of 20 Validators at the moment, your node can lose validating status if it has the LEAST bonded amount.
This is due to dropping the minimum validator count from 69 down to 20 (temporarily) for testing purposes.
Essentially, 20 validators are selected every Era with the probability based on your CSPR stake. Meaning, any validator can still be selected - it’s just that validators with higher stake have a higher chance of being selected.
This is where nominators come in handy, but that’s a whole other topic.