Converxtodvd freeze in the middle of burning

[B]Suddenly i have problem in the process of burning DVD movies in convertxtodvd hadn’t have it before

the problem is after converting process the burning process start automatically but only after 3.5% of burning or more its stop suddenly its freeze nothing happenes no burning so I have to cancel it

Please help me on this [/B]

What Media are you using?
What version of Convertxtodvd?