The ipad mini i was just working on would keep activating the home button and kept going to siri.. I first tried to cover the contacts on the home button flex like others in this post suggested with no luck. I also used some doubled sided 3m tape to create cushions on both sides of the home button (leaving the backing on the tape to give a little more thickness) to raise the button up from the frame a little to give it a little relief. This solved by problem. Not sure if it was just the extra cushioning i added or if it was a combination of cushion and covering those exposed contacts. After changing 3 digitizers and getting the same problem everytime im just happen to close out that ticket and move on..