hardset iphone

The first (and simplest) thing to try if something isn’t working right is to restart your iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:

Restart your iPhone - Apple Support

The next thing to try is to erase your iPhone and restore from a backup:

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

Finally you could try:

Restore your iPhone, iPad, or iPod to factory settings - Apple Support

And if all else fails, contact Apple Support.

You need to explain your understanding of “glitching”. What exactly is the phone doing?