I had an iPhone 7 32GB which never did this and just upgrade to an iPhone 7 Plus 256GB that does do it. It freaked me out the first time it happened, thought I might have just pressed weird or something so didn't worry about it. Then it happened again the next day so started to analyze the situation. I would have to press the home button hundreds of times to duplicate the issue so it would be impossible to take it in for service. I actually did a hard reset on the device yesterday and has been perfect till about 20 minutes ago. Was in the car and it happened again. It's like I can feel a weird haptic vibration, like a short vibration haptic response, not the normal haptic for clicking the home button and I can hear it across the entire device like towards the top, it's a springy type noise... It's like it shorts out for a very brief period of time and then back to normal. Other than that, my phone functions just fine, and to be honest, I had 3 different iPhone 7's and found weird issues (but not this issue) with every single one. I'm probably the most OCD person in the world mind you. I was shocked others were having this problem, so, I'm guessing it's a weird hardware thing but a very very very small chance it will matter to the life of the device.