Hello, I have a model # R-115SW. I purchased it roughly in spring 2016. I think I am just past the 2 year warranty mark. Anyway, the sub gets limited use. Usually it's turned off or in the standby mode. I actually have 2 of these subs connected to an Onkyo RZ900. The one that is malfunctioning is hard wire connected to the receiver. I have noticed that it has started making a clicking sound that repeats at the same beat /rhythm. This happens anytime the sub is turned on, not needed to be connected to the receiver or receiving a signal. Has anyone had this issue and an answer about what is causing this? The second sub is working fine and is connected wirelessly. I have had this system for about 2 years and never had any issues until now.