Meizu metal whatsapp problem

Hi guys,
I have a problem with my phone meizu metal. whatsapp don’t receive messages until i open it. someone can help me?
In power section of security app, i read that the apps, will be cleaned after 3 minutes on standby. there is a method to bypass or modify this rule?

Try putting this app into standby management. Find icon Security - Standby Management - enable the apps you don’t want the phone to close (ON). That should work. It did for me, although notification is still hapzard.

this didn’t work for me… i’m trying another way but still having the issue. i think they are called push notification.

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