I have very little idea what you question is or what your box is. However as you have mentioned Freeview here is a generic answer.
You probably have an aerial problem. Freeview needs a good strong signal to work properly; although some boxes are more tolerant than others. Check the alignment and connections to your aerial then reboot your set top box (STB) and do a rescan. If that doesn't work and aerial amplifier can often help especially if you are driving more than one set top box/tv from one aerial or you have Multi-tuner STB.
t, July 2008