I live in a duplex ( i am in the upper unit ) and in my unit it has a gas fireplace...I just turned it back on to take the chill out of my place..i keep hearing LOUD noises..almost like the metal was bent in and was bending out. It is loud enough to make me jump every time. Should i be worried, should i keep it off, is this normal..Some one please help me understand this. email me back at sexy(dot)nixxx(at)gmail(dot)com