I am owner of a Lumia 820 for two years now. I like Windows Phone, but since the 8.1 update I am experiencing issues with the wifi connection and my notifications.
The main thing is that I am not getting most of the notifications (for example from messaging apps like WhatsApp or Telegram). When I sometimes get them, they are like three hours too late.
I am examining this issue for several months now and it does not matter where I am, if I am connected to my WiFi or not or how good my cellular connection is.
The problem needs to be somewhere else. After long researches on the web, I noticed that the option "Keep Wi-Fi on when the screen times out" is missing on my system. There are a lot of users reporting the same, but there are also others who still have it. Some of the ones who are missing it are reporting this option still takes effect on their connection, but now they are simply not able to change it back.
There seems to be no way of changing that behaviour. But other WP users are getting notifications just fine. This issue is really annoying, because messaging is nearly impossible. Is there anything I could try in order to get proper notifications?