Hi, recently I have purchased a subwoofer. And after about 3 months of usage, I notice that whenever the subwoofer first turn on (auto on ) mode (ie. the receiver sending signal to the sub) it has a ticking sound (where it clicks for a few time and then it stops). The subwoofer did not sound distorted during playing of movie and film. But occasionally it has a sort of loose connection sound. I did not hear the sound before when I purchased it. Does anyone have any suggestion of solving the problem? I have tried changing the power cord and the subwoofer cable and I also verified that the connection is 100% secured. I tried to turn it on manually instead of auto on. But at the start it still has the clicking sound, eventhough the movie has not yet started and there is no sound coming out from the other speakers. The clicking is quite loud because I can hear it from about 3 meters away.