i've had a 3gx that came with new 600efl lose connectivity multiple times(luckily only once in flight). after 3 months of searching there seems to be no answer to this , is it the power input to the 3gx?....the sats?......the tx?......the cold?....the first letter in my name? i had mine setup as per the manual (and gone over by multiple others) and it flew great (first fbl unit so cant compare to others) for about 20 flights and then this(setup is either correct or not, something that is responding correctly and then just stops shows me there is a more serious problem). yes there seems to be alot of units that are working fine (remember mine was too) but when dealing with alot of money and more importantly the safety of yourself and others around its not a chance im willing to take. right now i am undecided between ar7200bx(spektrum beastx combo) and vbar 5 to replace 3gx.