what satellite are you pointed at ?
How strong is the signal and quality.
Maybe worth deleting all your channels and do a blind search
I usually just do tv search as never use radio channels and it takes up much needed channel space.
I think in blind search you can set the frequancy steps..ie 2hz 4-6-8-10hz
I set it at 2 or 4 if want a good search across the satellite.
Takes a while and you will get many repeated channels but you can always remove these