My WhatsApp on iPhone 7 Plus keeps hanging
anytime I open the WhatsApp on the iPhone 7 Plus, after a few seconds , it hangs and stops responding
iPhone 7 Plus, iOS 15
If that is the only app you are having trouble with, it may be best to contact Meta for support. If there is a bug in the app causing that problem, they are the only ones that will be able to update the app to resolve the issue.
https://www.whatsapp.com/contact
About the only thing you can do on your end is delete the app and redownload it again to see if that solves the problem. If you are using a VPN, you could also try deleting that to see if it is causing a conflict with WhatsApp.