Hello and thanks for the quick reply!
I agree with you on the housing issue, sir.
Coz when I went to the shop (from where I purchased: Vadya Sur Sangam, Nashik, Maharashtra, India ), it started sounding normally [I guess that happened during transit (maybe a loose part ??)]. But when I reach home, boo! the sounds needs fixing!
Due to this, the seller wasn't ready to repair my product.
And just to mention, I take utmost care of my instrument while using and storing (Of course, that's my first Digital Piano!) And I play the piano at medium volume most of the time. (volume doesn't seem to have any effect on the issue)
Once again, thanks Sir & have a nice day.