I retrofitted a COMAND 2.0 to a w208 clk recently and only breifly tested the system worked. When trying to use navigation the unit will work fine initially, but a few minutes into the journey it will say "your location is not on a digitised road" and sats read as 0. Ive tried relocating the antenna, but that hasnt helped. Ive ordered another antenna just to be sure it isnt that. Anyone know what my next step should be if the antenna doesnt fix it?