I went below 4.8 yesterday, went back up to 4.8 after getting two 5 star reviews but for some reason, without getting any other reviews, whether good, or bad. My score dropped below 4.8 again today.
If I’m not wrong, the analytics takes in considerations the past 60 days
so even if you do nothing, the score can change every day because it’s not based on the same period
This fellows explanation and image helped me understand.