There are only a few people since the rating issue was fixed who are having issues. This person is new to reviewing, and it’s not uncommon for this to happen at first. They need more agreements, and may need to look over criteria a little better.
Another person is having a ratings issue as they are in South Korea, and currently there is a known issue with Google Maps not displaying in South Korea in Wayfarer. This most likely has caused other South Korean Wayfarers to stop reviewing, as well as submitting, and the issue is causing ratings issues in that country.
While I did drop from Great to Good a few days ago, I assume this is due to there not being many people in my area currently reviewing, so there are still a good deal of submissions in voting waiting for more votes. Summer is a downtime where I live for reviewers. I expect things to pick up once school starts again, as they did last year, and my agreements to tick up more again.