No disrespect , quality issues or complaint about any of the banner images, but they don't seem to have changed much, for some time. Have admin gone on holiday and left it on auto? A bit of variety helps!
Nooo - leave them as they are. It's a nice selection at the moment - the imageselectatron has obviously hit a sweet spot, entirely at random of course, and what are the chances of that happening again? Best to unplug the tron quick I reckon!