Opens the door unintentionally manschmal

The product is more suitable for crafting. Would I ever expanding Sicherhietsgründen at the doorstep. When making the voltage at the Door Control System, the door also opens manschmal for about one second why always. The only way it would put even a delayed relay behind the output. Since I have used the system only for crafting and it's so cheap I give 3 stars. If someone says I like the unwanted opening of the door without additional components can prevent I give 5 stars.

Addendum:
I came very well with the manual. I read that there are many problems. Simply write the problem in the comment and I'll try to help.