opticum X7 canal plus problem

Hi All,
I have been trying different emu sw on an opticum X7 and have been getting different results with a problem when watching Canal+ sport on Astra 19e. With the older sw version amstar 1.3.81 the picture freezes and takes all sorts of messing around to restore a picture. Versions amstar 1.4.80 and 1.5.05 are a great improvement with the picture freezing once every 10 - 15 minutes but returning after 5-10 seconds. Does anyone have any idea of what steps to take.