Hi FUZZ,
There are a few steps you can take to troubleshoot your Soundbar.
First, start off updating your Soundbar. You can download the firmware directly from Samsung’s website by clicking “Support” in the top right corner. Then go to “Manuals & Software” > “TVs & Home Theater” > “Home Theater” > “Sound Bars”. From there, you can select the HW-Q600C under Q Series.
Download the update and install it via USB thumb stick to your soundbar. If you need additional help, there are how-to instructions on this page. Please know that Samsung Customer Service is here to assist as well.
Next, try doing a soft reset, unplug the soundbar from the outlet for roughly 30 seconds and then plug it back in.
If this still does not correct your issue, then do a hard reset. With the Soundbar on, press the + & - Volume buttons on the body of the soundbar at the same time for at least 5 seconds. INIT OK” appears on the display and then the Soundbar is reset.
~Samsung Solutions