I just went through the same issue with my ipad air 2. Tried all the various techniques with sharp instruments ( assorted scalpel blades/exacto knives)along the sides of the button, canned air to blow out anything that might be wedged, and got nothing. Went to Apple store genius bar where they did the same procedures to no avail. The unit was no longer covered by Apple care +. The solution they offered was a brand new identical ipad for $300.00. The unit worked perfectly in all other respects. Went to Geek Squad people and they wouldn't touch it. An independent cell phone/tablet repair guy quoted a price to open it, replace the switch as well as prepared me that there is a high liklihood that the display would break during the process and thus need to be replacing as well. The other option he suggested was getting the unit turned off, ( an option found in the setting menu), a couple drops of high concentration isopropyl alchohol ( i used 91%) around the edges of the button and then tap on the button some and let it sit. I went a step further and used an ultrasonic transducer device that I had just received ( Sonic Soak to be exact)and held this on the button for about about 5 seconds . Within that 5 seconds the button was up moving and functioning normally and thus far I have seen no adverse effects of having done this