My nexus 9 is the most disappointing piece of tech I've ever bought. It used to crash all the time when watching video which was the entire point of buying it,

My nexus 9 is the most disappointing piece of tech I've ever bought. It used to crash all the time when watching video which was the entire point of buying it, it crashes when it hits 40% battery, which is all the time because the battery only lasts a couple of hours.