My suggestion, check all connections between 211 and the dish with the dual coax coming out (your terminology is correct) Start inside and work your way out. Check tightness first (finger). Be sure the copper core (conductor) is not corroded (this would be primarily an exterior issue if it exists), the white dielectric (white material surrounding the copper core) should be flush with the internal base of the f-connector (hope that made sense to you), look for any sharp crimps or bends in the portion of the cable that actually goes to the 211, and most simply, check for loose connections (f-connectors) anywhere along the path. If the 625 works, your problem can be the path to the 211, the port on the lnb that the 211's cable attaches to, or the 211. Having said all this, you may just want to switch the 211's cable to the 625's port on the lnb (or another port on the switch, although I would'nt think there would be one with only 3 orbitals in the equation...plus the way you described the dish/coax scenario). Anyway, if switching cable prts solves the 211 problem (run check switch after switching cables) you will see (probably) a 625 problem now. If thats the case,.......bad LNB.