After 5 days faulty

At first I was excited.
Motion worked flawlessly, turned quickly, and after the set time and again.
Unfortunately went after about one week of operation, the light no longer sufficient.
Once disconnected from the mains has helped it had again to work for a day.
Now the unit turns on immediately after connection to the mains and no longer!
Thankfully Amazon offers a perfect return service.
Even a return label (Hermes) was offered to me.