Hi my Samsung HTX810R Samsung

Question

hi my Samsung HTX810R Samsung 2.1 ch Sound Bar with Built-in DVD, 300W with Wireless Subwoofer and Bluetoothit all works ok apart from every now and then a very loud noise (like thunder)comes out for about 5 secs,the room vibrates and scares the little one like h**l.as the subwoofer is wireless i made sure there are no obstructions in the way.ant help would be great cheers