I have a problem with my setting on BBC1 I am getting 35% snr but when I go menu/set up/service searching/positioner set up, then down to positioner fine movement, I just move it a couple of times on step west then I get 90% so I then go down to positioner storage, press green button (store position) I then exit all the way out but then I found out that it has not saved it? what am I doing wrong?