I’ve noted that sometimes I can literally watch my battery percentage drain down from 100% to 49% in minutes. At that point it shuts down my ipad sometimes for hours sometimes for minutes. If it’s minutes it’s come back showing 100% charge as well. I went through and shut down all the possible notifications, mail pull etc. etc. etc. and NOTHING worked. So I started closing applications and watching the battery and in the end when I shut down Firefox it stopped. I’ve found some references to the issue on the web to so I’m not alone. FYI I usually use Firefox for Breitbart.com and Disqus. I’ve moved back over to Safari and no problems so far.