I am developing an application that requires many SPARQL queries to the wikidata server (1k-2k each time I test it). The application front-end is visible here: https://beta.water-fountains.org 

I am just making SPARQL queries from a nodeJS server to get information about fountains.

This has been working fine for about a year, until yesterday, when the connection started returning ECONNRESET or "Socket hang up". If I run the query from the browser instead of the server it works fine, and if I use a vpn, the NodeJS server is able perform the queries without issue. Here is an example query:  link 

Has anyone else had such an issue? Thanks!

Matthew