delay then klunk to 4th then stuck in 5th 2006 cooper s auto sport shift
 

my 2006 cooper s sport shift automatic will lock up after driving / will clunk esp. downshifting into forth and delay before shifting into gear / and then will also lock into 5th gear with out shifting at all . if i turn car off and back on it will work again / flushed system several times and reset ecu . any ideas what causes this