1.3i 16v Automatic Transsmision problem?

Hello! I have a problem and i wan to know how serious it is. When i wake up in the morning and i start my car i the car can't move in the D and L gearbox for 10 or 15 minutes it is like it was in neutral but can move reverse in R gearbox and after 10 or 15 minutes everything is normal with the gears but this problem happens only where motor is cold not active often in the mornings. The oil of transsmision is fine and when switch gears is normal doesnt has the problem car. My questions is what causes this and is serious this problem is my Transsmision to the end or can be repair this?
 
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