I kept hitting the power button (seemingly worse on the Verizon model) so I found this app which places a thin vol bar hidden on the side of the home screen etc. It actually works pretty nicely once you set it up right. It can adjust the vol or bring up the vol overlay by just sliding your finger up the very edge of your screen and it doesn't need to add anything to the notification panel which is nice. Not for everyone, but it's an alternative, and free if it helps anyone the link is below.
https://forums.androidcentral.com/e...rbigpepper.VolumeControl&hl=en&token=BkVu5kyN
https://forums.androidcentral.com/e...rbigpepper.VolumeControl&hl=en&token=BkVu5kyN