I think i've cracked it! I've been having the same connecton problems, so while browsing, i discovered that i was getting this "id 4226 error event". I'm absolutely crap with putors so i cant put a link in, but try putting " error id 4226 " into google and click on to "blog.davidkaspar.com/archives...". Skip 2 pages until you come to the event 4226 patcher bit on lvl lords website. download and execute the patcher.
I followed the simple instructions (changing the 10 half open connections to 50) and after rebooting EUREKA!
Hope this helps .