I had similar issues with 1 Blade. After fiddling with everything, someone informed me that my Dlink router was garbage and could have been the issue. I upgraded to new Belkin Dual band, Miner has been stable for weeks now. No random disconnects or proxy changes.
these are located in a server room with all high end equipment. I can't fathom stuff that can handle mega traffic would trip up on this stuff... but its gotta be something...
I have both going to the same worker, maybe slush's auto diff thing is setting the diff too high...
I am gunna try changing to 2 workers