im not reciving push notifications or reciving them late using whatsapp on my Poco f3 android phone...

even after formatting all data and only installing whatsapp...

i also tried reseting my network and setting it from scratch in the deco app but it didnt help...
what i do is lock phone screen and wait about 5 minutes then send a message from another phone and the notifications wont arrive or arrive late...

ive turned off any battery restricting setting on my phone and even tried downgrading changing firmware but nothing helped...

when i use mobile data i dont have this issue at all...
is there any way to fix it?