I think I may have found the Battery drain/heat cause. 4 days ago I disabled "connect with Xbox" and "Xbox music+cloud" since then the phone has been 100% NO heat no battery drain. I 'm not sure which one may have fixed the issue. Before I made this change I would have sporadic battery drain and heat from the upper part of the phone. The only other change was removing the Accuweather app and replacing it with the Microsoft weather app, but I am certain I tried this once before and still had issues. 920 for sale anyway Ready for the 1020 on preorder!!!