You don't use latest modpack. Attach logs from the latest modpack. Also try developement XVM, stable is rarely stable.
edit: the rumor says it's a game bug.
Hi Dana :)
I've been told that WoT users receiving such advices from WoT support. Additionaly, indirectly, my advice was also affected by the fact that e.g. Discord also causes (or caused) problems when overlay was enabled.
Installed same mods and they work fine.
Maybe it's related to your very high screen resolution, what happens when you switch to FHD? Alternatively try to reset game settings by deleting preferences.xml file.
404 is good sign, better than unable to connect issue.
Try this one: https://drive.google.com/file/d/161b3iVvtNTZ3VWSXbtrPZOJM0EOkOzmy/view?usp=sharing
Which latest version of modpack worked correctly for you? Try this modpack and let us know https://drive.google.com/file/d/1kNGwk-g_zHvfvA1ycdCHs3pMUAaUvwhs/view?usp=sharing