iPhone 7/Plus Vertical lines in panorama photos

[TGB77]

I notice in some of my panorama photos vertical lines which appear about a quarter of the way from the left. They don't show up on all my photos. I suspect it is due to the vibration on the phone which is made when I press the start button. If shooting a panorama on a very windy day, the vertical lines are scattered across the entire photo. I've attached a couple samples.

 

[fred98tj]

Stitching problems. A panorama is not a single photo, but rather a series of photos that are taken then stitched together.