I am also having the same issue. Same location and running off the same PSU (Dell 1000w server). One of the miners also has a temp reading issue though, not sure if that makes a difference. See pics
Already tried to upgrade to latest firmware. When I got them they were on stock firmware. Made no difference though.
http://i.imgur.com/z3is70L.jpghttp://i.imgur.com/5y2A6wI.jpg
