Default notification delay

im having a BIG problem with my phone
when the phone sleeps for about 5 minutes
i stop receiving notifications from what'sapp, facebook, messenger...etc until i open the app itself and wait for it to receive data again

i looked it up a lot ... tried may things but no use

ps: yes my wifi settings are to always keep awake
Thanks Button wont hurt if i helped

HTC Desire HD - Eng S-Off
4Ext Recovery Touch 1.0.0.5 RC9
Provider: MTN Syria
ROM: SVHD 1.7.5
OS: Android 4.0.4
Sense: 4.1 Full