The rear speakers of my HW-K950 continuously crack & pop. Though the Multi-room app it says I am using the most current firmware. The only solution I have found is to unplug the speaker & not have any rear sound. getting really annoyed. Sound bar was connected to source through optical cable but Switched to HDMI (ARC) connection. same issue with either connection method. Also, cracking isn't dependent on source- cable box, DVD, X-box. it does it with all of them.