I didn't think it would be that time consuming for you to let me know a few of the specific artists you weren't receiving notifications on since you are aware that you are missing them then  was assuming you had a few favs names and the image name  already to pass on to us for research?
I don't need you to go back on any or to go through them all but just right when you notice something you didn't receive on a specific artist and image then let us know that info. 

And yes of course we will research it to try and isolate the problem.