Might be one of two things first try to do a rescan next it might be your openbox X3 switch that off do a rescan and see, if your channels come back then it is the openbox. If like other openboxes, the x3 is putting out a higher voltage to the lnb to cure this the voltage needs to be reduced using a capacitor or on fleabay there were ready made kit selling for about £4.00 or £5.00.