Ive had my s8 for 2.5 yrs. Lately I've noticed that if I swipe my finger about 1/4" above the screen over the apps I can feel a clicking vibration is this normal?, it doesn't do it all the time. Now I do have slight cracking on the back curved area next to the bixby button. I've had an Otterbox on my phone since I've had it, recently took it off, that's how I noticed the issue. I'm looking at an upgrade shortly.