I had simmilar wierd connection issues just after updating to RTB 3.4. in a nutshell, my dedicated server would constantly freeze on startup with "got bad connected receive event".
So I disabled RTB (rename zip file) and it started just fine, and ran for 24hrs with no issues. The next day I downloaded RTB 3.4 off the website, put the zip file back, and things have been working fine ever since.
based on that, I suspect the auto-update did some kindof wierd corruption with the RTB zip file or mabye some of the settings.