Does it happen when the spin cycle gets faster? If so, there could be a defect in the drum, or there could be an unbalanced load. Look up how to put your washer in test mode, and then run a spin test with no load. Make it run at maximum speed with no clothes in it first, and if it still vibrates then it's not an unbalanced load. If it does, it could be a problem with the washer. This can also be caused by a washer that is not level or on an uneven surface. Try leveling it by using an adjustable crescent wrench to turn the leveling feet up and down to make it sit level on the surface. Hope this helps.
Not necessarily true. I get 3 year old 6s’s that have the adhesive come right out. Just did one today in fact.
Then you had an iPhone 6, not a 6s.