XHR error GET sockjs error - why am I getting so many?

I’ve asked before why I’m getting so many sockjs errors. As you can see in the DataDog screenshot, they represent 64% of all errors that are being recorded:

It’s happening when my Frontend Electron app is calling the Backend server hosted at AWS (two different URL’s):

Happens to both Windows as well as MacOS versions, also at various URL’s of my Electron app. I can see different users from across the US (FL, MA, CA eg), with different ISP providers.

At the same time, thousands of calls go through without any problems.

Does anyone else observer these XHR GET errors as well coming from sockjs in their log files?

Thanks in advance!