WhatsApp notification problem

[HNITISHGEHLOT]

No notification many times on whatsapp
Mobile os is block background network usage for whatsapp some time 

[SHNB]

yes on mine too

[ssateeshk]

look whether VPN is on. Sometimes VPN is blocking the background usage.

[Phanikumar-75]

By mistake you might chosen the option not to show notifications from whatsapp. Go to settings - apps and select whatsapp and change its permissions to show notifications popup.