For the company to fix it, always have a countersunk power button, with a guard to prevent it popping out. The alternative is a capacitive button but these can also fail when dropped easily. The last, most insane, but most interesting option would be to turn the device on using a leed switch when the magnetic pencil is removed from the side of the case. For the end user, if they want to fix it, follow this guide https://www.youtube.com/watch?v=RjkNevWmIIg&t=0s