I have a very annoying problem with my Galaxy S II. When updated it to Android 4 I stopped receiving notification from various apps on my notification bar (at the top).
So for example: Facebook and Facebook Messenger doesn't show me when somebody wrote a new status on commented on my own etc./ Gmail doesn't show me that I have received a new e-mail and even Draw Something doesn't send me any notifications.
I noticed that sometimes when I switch from Wi-Fi connection to Data I suddenly get some of the notifications or they are about 5-7 hours late. When I was on 3.6.6 this problem occurred less often.
Why is this happening and is there any way to fix it? Is it the matter of the phone or the applications?
I hope you can help me. Thanks in advance.