I have been using Hisense HS212F 2.1ch Sound Bar for the past two years.
In the recent times, it is turning on and off continuously. It is frustrating as the audio output breaks multiple times. My power supply isn't at fault. Now, I don't know what's wrong. Help me resolve this issue so that I can use the soundbar.
After seeing your problem, I would say that this is definitely an Internal hardware components issue. So, it is better to contact Hisense Customer Support sooner to get your Hisense soundbar back to normal. I would also recommend that you verify few things before contacting the support team.
As you confirmed that the power supply isn't a problem; check whether you have connected the devices firmly to the TV. If so, check for cable damage and replace it if necessary. In most case, this resolves the audio output breaking issues. Then, check whether the soundbar is working properly. If not, then go to Hisense Customer Support for help.