A nice scan of NOAA 18 this morning.I think that I have found my problem.
I was about to have a look at my antenna cable today.I noticed that the filter bandwidith in Airspy was at 220.960.
I reset it to 45.005 .working fine now .I have no idea how the bandwidth got changed to 220.960.I swop between WFM and NFM a lot that should not do it though.Something else to watch out for.