I have this same problem with the haptic touch and scrolling when I am in the middle of reading something on my iPhone 11. . It happens erratically, sometimes two or three times a day and then skips several days or a week before it happens again. I get the haptic "thump" and then the "mad scrolling" begins, lasts just a second or two, and then reverts e back to the beginning of the article I was reading. It is maddening, and makes me hate Haptics. I am not touching the scroll bar, as I tend to use my scrolling finger toward the center of the screen.
I have posted this on numerous forums, and have gone to several ATT stores that sell Apple products in my town, and so far, no help or solution. I have seen this same problem in dozens of posts. You'd THINK Apple would take notice ????
Any solutions would be much appreciated !!
gladys2