Same issue here... My HW-K450 soundbar will turn itself back on a few seconds after my Samsung SUHD TV is turned off (the bar begins searching for the TV). I’m hooked up via Samsung’s SoundConnect, and I started having problems a few weeks ago (prior to that, it’s been working perfectly for nearly 2-years). Well, I got the USB adapter, updated the firmware, reinitialized, etc., and, nope, it didn’t fix the issue. I also tried unplugging the bar, waiting over a minute, and still no solution. I subsequently had a long text chat with Samsung technical services, and we tried just about everything I already tried (firmware update, reinitialize, power down and up) including resetting the TV to its original factory setting to no avail (I have the most updated TV software). Nothing worked; the bar is still turning itself back on. The tech’s final “solution” was suggesting I take the bar to an authorized Samsung repair center to have it checked. Very frustrating. I told the tech about this thread, and provided the link. I don’t know if he’ll check it. When I asked if a recent TV update could’ve caused the problem, he didn’t know. I’m not sure what I’m going to do but I really don’t want to take my bar to a repair center. I’m going to wait to see if any future TV or bar updates might fix this. UPDATE 1/28/2019: Well, it looks like I may have resolved my issue (I say this tentatively). Again, after updating the firmware, reinitializing, etc., the bar kept turning itself back on after turning off my TV. Previously, I didn't have any issues for nearly two years until recently. Anyway, I wondered if SoundConnect was the issue so I connected the bar via HDMI cable and it appears to be working: It turns on/off with the TV, and doesn't turn itself back on after I turn the TV off! I'd prefer to use SoundConnect; however, if this actually resolved the issue (and it looks like it has), then I'm good with it. So my suggetion to other users with the same problem: Update the firmware, see if that resolves the problem (if you're using SoundConnect), and, if not, try connecting via HDMI. Hopefuly future firmware updates may resolve the wireless connection.
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