[Q] Background data doesnt get turned on topic

I have a problem with my htc one m7. It seems that background data doesn't get turned on. I have the following settings:

• mobile data: checked


• limit mobile data usage: unchecked


• alter me about data usage: unchecked


• restrict background data: unchecked

• I use the stock rom with bulletproof kernel.

The app i use most is whatsapp. But i only receive messages when i open the app. When i play a online multiplayer game (which obviously needs internet connection) i do get the messages coming in.

I've searched on google and asked on another forum but i can't find any solutions.

Does anyone have a clue?
Help is appreciated!