Question Display Off Problem

I've searched the last pages but I wasn't able to find something related. I'm sorry if there's already a thread with this strange display behavior.

OK. When I'm shutting off the display by using the button on the back of the phone or using a gesture with the help of e.g. nova launcher and screen off the display shuts off. So, normal.

But it happens very often that the display shuts on again automatically afterwards. Just a second later. So I've to shut it off again. Sometimes three or four times till it remains dark and off.

I'm currently using the cm11 build on 802 but the behavior has been the same before. I was just too lazy to search and care. However, I've searched today but couldn't find anything. Of course, I've perhaps used wrong keywords due to my bad English..