Spontaneous Haptic Feedback Arousal

Trying to figure out, why occasionally, though randomly, and without any consistency, the haptic feedback keyboard sound on my iPhone 15 is emitted at full volume, typically only very briefly, before returning to its appropriate and more subdued designated setting, which is oftentimes set to silent, but when active, never set to full throttle. The spontaneous max volume haptic feedback that I might add is unassociated with my concurrent activity or usage, is literally startling and has caused me serious alarm because it is so loud and unexpected. It gives intentional software programming function vibes, which makes it all the more creepy and annoying.