I'm wondering if phones as old as the Lumia 920 will recieve new firmware for WM10... I have always had issues with the 920 overheating and thus the touchscreen unit becoming unresponsive. This got to the point where I had to "unlock" the phone on a daily basis with a cool pack. On top of this the battery life never got over 6 hours approximately. I even had this problem on 8.1 but not that frequently. My guess is that this is down to firmware not being optimized for WM10 yet. System resources are maxed out for simple tasks and the phone overheats.