600 listings not displaying

Hi. We have over 600 listings and are having trouble with them displaying. Everything worked fine when we had just 100 or so listings. Then, when we hit 350 or so, the pagination broke (it was set to only show 30 at a time) and it started displaying all 350 at one time. Now that I’ve published another 300 (bringing the total to 650), the listings are not displaying at all – the page is just blank. Here is the shortcode we are using:
[listings taxonomy=”listing” term=”collection” columns=”3″]

Again, I have not changed the code and it was working perfectly. The only thing that seems to have changed is the number of listings. Any ideas? Thank you.

https://wordpress.org/plugins/wp-listings/