Durashift Change Problems

Hi i have a 53 plate transit durashift

only just bought it so know no history of the van at all but it's only done just over 60k

the gearbox is a bit lumpy when changing up and down and when i go to slow down at roundabouts etc and then pull away before it's stopped it doesn't go into a lower gear it'll stay in 4th or 5th etc

if i change it manually it's fine though

has anyone had any of these problems?

i've taken it to my local transit specialist who said change it to a manual ............

not a good response when i travelled 300 miles specifically to get an auto transit :~/

any ideas gratefully appreciated

Steve