Hi John2x18,
Thank you for using Apple Support Communities.
I see that the volume button on your iPhone 11 Pro has delay and the internet connection is getting slower. Have you tried restarting and checking again?
This article has more information on how to do that: Restart iPhone - Apple Support
Is the internet connect slower when you use cellular data or when you are on Wi-Fi? Have you tested while connected to a different Wi-Fi network? Does the issue happen while using all apps or certain ones?
Reach out to the community to let us know how it goes.
Cheers!