SEO weather report:
SEMRush provide this useful widget so you can see if your site might be affected by changes in the Google algorithm.
If the number is high, say above 7.5, check that your website remains in its position for your search terms. If not, maybe we can help you understand what happened.
Algorithm changes happen all the time. Some are verified by Google, other times they just keep quiet.
Its in your best interest to stay aware of them and the effect they can have.