Hi there,
i don't exactly know what would be causing your client to hang, especially if you use the latest drivers.
There there was an issue that would cause a client to repeatedly crash in spectator mode on computers with GTX10xx cards, putting 'oqwait 0' into the autoexec would help with that.
I see you use AMD, have you tried other, modded clients? Vanilla Sauer currently still uses SDL1, and i would recommend you to try a client mod, possibly with another SDL version. A list of good clients can be found here:
http://www.sauerworld.org/clients/If you need help installing these clients, or if the issue persists, you can join the Sauerworld discord support channel, where there are possibly some people who could help you, and at a faster rate than here at this forum. You can find the invite link in the main menu on sauerworld.org