@Cheedeeraah: Sadly it isn't possible to disable the screenshot feature on Galaxy devices. Typically, a screenshot is captured by pressing the Volume Down and Power buttons together for 1-2 seconds. If you have a case or cover on the phone, try removing it temporarily to see if this helps.. You should also check to see if the Volume Down button is sticking, which might explain why the screenshots are being captured unexpectedly.
To test the hardware, please head to the Samsung Members app > Press and hold on the app icon > Diagnostics > Phone diagnostics > Buttons, and follow the on-screen instructions.
