Hi there, I had roughly 800 images indexed by Google but noticed that from time to time the number of indexed images would go down to zero for one day and then up again. I thought that is just how Google does things. Then at the beginning of March the same happened, the number of indexed images went down to zero but this time, it didn't get back up the next day. It seems now the number of indexed images only increases very slowly over time. See attached image.
Does anyone know what's going on? Thank you.