Had my 8 Plus since release day, no issues with scrolling. Not even on my previous 6s, or in any of the iOS betas I've tested.
Have you performed a hard reset (this does not delete or re-install anything)?
Quickly press and release volume up key. Quickly press and release volume down key. Press and hold down power button (even if you see "Slide to power off", keep pressing the button) until you see the Apple logo, then release and allow the phone to reboot.
If that does not help with the scrolling issue, reset all settings under Settings > General > Reset > Reset All Settings. You'll need to re-add WiFi passwords, Fingerprints, and any cards added to Wallet.
If you try both of those things and they still have not helped, let us know and we'll discuss where to go from there.