I upgraded to latest version (1.1.725) and after scraping jobs run for about 15-20 minutes all my proxies start timing out. When I switch back to latest stable release version (1.1.712) running same tasks and using same proxies everything runs fine. I am using net::http parser. I can reproduce this across 4 different servers. I've been having trouble lately installing beta releases so it very well could be something with my servers.
