The latest Android Lollipop 5.X based Cyanogen OS 12 update brings a lot of new features to the Micromax Yureka YU, but at the same time introduces a annoying bug which breaks the proximity sensor functionality of the phone and the user is left struggling with blank screen during an incoming or outgoing call. One can imagine the frustration when screen is left in sleep state when receiving a call making it impossible to pick up, and unable to disconnect when the call gets picked up from an woken screen as the screen goes back into sleep mode. Thankfully there is a simple fix as shared ahead.