Device LG Optimums 7 870 The back button, and menu buttons have stopped working. This Phone is only one year old and is housed in a secured protection case and properly handled. For all the money that this device cost, it has been sent to the manufacture for sound and network issues. What a piece of junk. Seems to be a device issue, but could a programming conflict keep the device from performing the function. Darn shame. Money wasted. Do you have a resolution for the device issue?