"use each line one time" along with "Only read" setting.
That way each thread will start new browser instance and
use new resource line because its set to use each line only
one time. When all proxies are used one time, script will
finish.
What's with all these errors in 28.9.3 
Getting tons of these errors on all sorts of proxies (mobile/ residential) from different providers.
The same proxies work very well in normal browsers, antidetect browsers, even in automation tools like the BAS competitor that we all know
LE: When the proxy is set, the HTTP sniffer gives these errors:

