You have to buy some drying paper (sorry I don't have the exact name). Available in supermarket. They have the function of removing the static and preventing fibric tired together and give you present smell afterwards. I hav e used them before it is nice. But for saving energy, I don't use the drying function of my 2 in 1 washing machine.
Another possible reason I guess, the washing drum is very dirty inside you have to wash it periodically (wash with normal cycle without adding clothes but add some bleach or vinegar, I prefer vinegar).