I'm not sure why it stopped working. I'm running [Definitive][Rom][N910VVRU1ANJ5][4.4.4] Root Deodex/Knox-Free/Debloated/Fast/Fluid and my computer used to automatically open a pop up window showing the phone when I connected the phone through USB. Now I have to always pull down the status bar and check the MTP box to get it to connect. Anyone know how this can be fixed to automatically mount?