Volume bar controlling itself & on/off button not working? (LG G Pro Lite- Android 4.4.2)

[AC Question]

Since 2 days, the volume bar is going up by itself and its making my phone unusable. I restarted it thrice but it's of no use. Everytime I use my phone, the click triggers the volume bar to show and the phone goes from silent-sound-vibrate. Phone bought in early 2014.
OS Android OS, v4.1.2 (Jelly Bean) (WHICH I UPGRADED TO KITKAT)
Chipset Mediatek MT6577
CPU Dual-core 1 GHz Cortex-A9
GPU PowerVR SGX531
Please help, thanks.

 

[dpham00]

If you have a case, try to remove it to see if the problem persists