Whatsapp calls don't come through if phone isn't used for few hours

Good day to you Buttermilk247, 

A few things to check - 

• Make sure Background App Refresh is enabled and that WhatsApp is also enabled. Switch apps on your iPhone, iPad, or iPod touch
• Test the issue on both Wi-Fi and cellular data to see if there is a difference in the network. 
• If there is any VPN or security software installed on the device, remove it, restart your device and test again. 

You’ve mentioned that your apps are up to date. Deleting and reinstalling the app may be necessary and you can also reach out to WhatsApp support for assistance if the issue is isolated to the app itself. For example, if notifications come in for cellular phone calls, messages in the Messages app, etc and the situation only impacts the WhatsApp app. 

Redownload apps and games from Apple

How to contact an app developer

Thanks. 

Buttermilk247,

If you've uninstalled and reinstalled the app, then the next best thing to do is reach out to the developer directly.

You can also reach out to Apple directly here: Get Support

Take care.