WIFI Connectivity Issue with iPhone 14 Pro on 5GHz WiFi Network

First, this is a user-to-user forum, not an Apple support site; from your post it isn’t clear that you are aware you are not talking to Apple. 5GHz has shorter range that 2.4 GHz and doesn’t penetrate walls as well as 2.4 GHz, but it should be comparable to other phones. If it isn’t then most likely your phone has a hardware problem, and you should contact Apple support.

One possible cause: Do you use VPN? If so, delete the VPN profile in Settings/General/VPN & Device Management/VPN. Don't just turn it off; delete the profile.

Apple’s formal support can be reached several ways:

• Click on “Support” at the top or bottom of this page
• Go to Contact Official Apple Support

Note that both of the above have options to receive a callback or chat

• Install the Apple Support app on your iPhone or iPad - you can contact support directly from the app, and the tech will have (with your permission) access to diagnostic data on your phone
• Call Apple Support; the phone numbers are in this link→Contact Apple for support and service - Apple Support
• Make a Genius Bar appointment at an Apple Store→Genius Bar Reservation and Apple Support Options - Apple
• Find an Apple store or Apple partner service provider→Find Locations

My friend, when the device falls repeatedly, points inside the motherboard break off, which leads to a weakness in some of the device’s capabilities, such as Wi-Fi, cellular network, or Bluetooth.