If your Vizio soundbar also turns ON or OFF itself, there could be several reasons for it. What is the problem depends upon what you are doing with the sound bar.
Some people faced this issue because they programmed a remote to work with both TV and Vizio sound bar simultaneously. The problem faced by such people was that the sound bar turns OFF once but after some time it turns back ON itself.
There are several reasons for ON/OFF problem like firmware update, Eco settings ON/OFF, Reset required, using another remote instead of Vizio remote.
To solve the automatic ON/OFF issue with your Vizio sound bar, follow these methods.
Firstly, you can try resetting your Vizio sound bar. Resetting will remove any problem if it was caused by change in settings. You can read our guide to reset Vizio sound bar.
You can try changing the Eco settings of your Vizio Sound bar. Sometimes it also solves this type of issue.
If your Vizio sound bar has out-dated firmware, you should update them to the latest version. You can take help regarding firmware update from official Vizio site.
If you are not using the genuine remote of your Vizio sound bar, it can also cause automatic ON/OFF issues. If your original remote is lost or you are using another universal remote, try once with the original Vizio remote and hopefully it will solve the issue.
If none of the above methods worked for you, you should reach Vizio support. You can explain the actual problem and they will help you with that.