Thank you for getting in touch, we do appreciate your time tremendously.
Unfortunately, this error, as described, is due to server resources being exceeded. In order to resolve this issue, you will need to contact your host and request that they increase your server memory to allow markers to load fully.
When server resources are exceeded, the server may crash causing unexpected results outside of our control.
My apologies for the inconvenience caused, I hope this helps clarify what is occurring on your site.