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

Note 2 N7100
DN3 v5.2 full S5 UI
Rooted with TWRP installed