Why does my mobile get unplugged when connected from the laptop?

[SS024]

why my mobile get unplugged when connected from laptop ?

i have earlier updated my phone. Now it is 4.2.2. And settings are coming in different format. Now my phone is not connecting with PC. when i connect my phone with my PC it shows connected as media device. now i want to change the setting from MTP connection to Mass storage. Bt options are not showing please help in this regards.
Thanks