PEUGEOT 807 IMPDA ELECTRIC TRAKE PROBLEM

Hello:
The left (electric) back door of my Peugeot 807 HDI when closing, goes to jump, giving pulls, sometimes it does not close and open again. Even helping her is not going well.
It happens especially when it is hot.
Pushing it without action the electric command closes and fits well.
They tell me that it can be the problem of the electric motor, but I do not believe, because it closes well when cold sticker.

Can anyone help me?
Thanks in advance.

Actually, if it is the closing engine problem but you can try regulating by hand before, the detail is that if you cannot act by hand when it fails then it is the engine, they are not worth much if they are alternative and nothing from the other world the change.