The Huawei M3 gave me an unpleasant surprise a short time ago. I had it in my hands while doing something and my daughter (age 30) offered to hold it for me. When I received it back and turned it on, it was factory reset. What happened?
It turned out that it's possible to reset the blasted thing merely by holding it. If someone grabs it and pays no attention to what's on the screen, then it's easy to press and hold the edge power button inadvertently. That brings up a dialog that has 2 touch buttons for power off and reset. The same hand that's holding the power touches the screen and causes the reset (a knuckle where the finger meets the palm does that perfectly).
The following combination of factors makes this happen. 1. Power button is on the edge, and it sticks out. Some tablets like Kindle or Nexus have edges somewhat slanted, so buttons are somewhat protected. Holding the tablet across the face engages the power button. They could at least place the power button on the short edge of the device. 2. The size of the tablet is just large enough that a normal person can hold it with one hand, but has to stretch. Therefore, the base knuckles touch the surface. On a larger tablet, a human hand is not large enough to hold it like that, and on a phone sized device the palm cups, so it does not touch the center of the screen. 3. The protection against accidental reset is essentially absent.
Huawei, not even once.
Google, bring back the Nexus 7, please.