It could somehow be Soapbox or Ditto that's the problem. But it makes no sense that it works perfectly on one machine every time, and never works on the other machine. 

 I deployed a custom build of Soapbox with extra logging to gleasonator.dev. Can you please try logging in there?

https://image.nostr.build/f0e05fb63c7f411d7bae20e73c9c17e8cffcc86b954bc6b02b603e85366ebfd5.png