We have been in our house for 8 months. The house was a resale, only 2 years old. Our plumbling all around is fine, we had a good builder. But our ensuite from the master bedroom toilet always makes a loud sort of banging or something when we flush it. I have no idea was it is. It might be rattling, but you can hear this noise through out downstairs when you flush. I am worried that we are doing damage or that a pipe will burst.. should be break down the wall to see.. ? anyone have any idea what this could be...? Any advice would be wonderful!