i have been burning my movies at 4x for bout 4 months now an ittakes about 15 minits to burn.but i tarted to notice when i burn at the same speed it takes way longer than b4,ittakes bout 30 to 40 minutes to burn now.can someone tell me whats the problem an having.i can,t remember the exact type of burner i have,but any help would be highly appriciated