Unhappy Sony Xperia Miro Issue- Please Help !!

Hi,

I've bought a Sony Xperia Miro about a month back and I've been using it without any problem until last week.

Problem is that The volume button is spontaneously getting increased with a 'ding' sound without even touching it 4-5 times for every 10 seconds. I've removed the back cover and used it for few hours thinking that the cause is a tightness level in the back cover but I started to get the 'dings' in that state also.Sometimes the same happens with the power button on top of the mobile, I can't turn off the display by pressing the power button and again I'm assuming that the power button also is suffering from the same thing as the volume button.

I bought this mobile from Dubai and I'm residing in Sri Lanka. This has put me in a very difficult situation. Please help me with a convenient solution about this.

Thanks for Reading and Helping

Sam