Soundbar sometimes switches off

I bought an Adelgo 3W soundbar which only requires a USB connector at the beginning of November. It worked well until a week or so ago. Now sometimes when I am listening to something on the soundbar it will stop broadcasting and the sound will come out of the speakers which are integral with my monitors.
I cannot find a website for the manufacturer.
If I try disabling the monitor speakers I suddenly find that the sound stops completely, as if the sound source has been switched to one of the disabled monitor speakers. There are also plopping sound coming from the soundbar occasionally, which did not happen for the first few weeks.
When I go to Settings, Sound and change the Output device sometimes the sound does not move to the newly selected device.

Windows has installed the driver for this soundbar, and if I try to update it I just get a message that the best driver is installed. Uninstalling the soundbar and plugging it back in again does not resolve the problem, nor does rebooting. I have also tried plugging it into different USB ports which does not solve the problem.
Check Disk and System File Checker show no problems and Windows Home has the latest updates installed, (Version 20H2, OS build 19042.685). I am inclined to think that the problem occurred after one of the Windows updates, but maybe I am clutching at straws.
If anyone has any suggestions I could try to attempt to resolve the problem I will be very grateful.

Are you sure that the battery in the Bar is getting charged properly? I have had a similar problem, caused by the smart plug supplying the mains charge being accidently switched off by a remote handset -- no problems now I know. I had 'plopping sounds' which were the Bar's warning that the battery was getting low.

clayto said:

Are you sure that the battery in the Bar is getting charged properly? I have had a similar problem, caused by the smart plug supplying the mains charge being accidently switched off by a remote handset -- no problems now I know. I had 'plopping sounds' which were the Bar's warning that the battery was getting low.

I don't think it has a battery. There is no way to replace one if it is there.

If he only connection to the soundbar is USB then it has it's own internal USB sound card which is entirely separate from the PC onboard sound. So when the soundbar disconnects the PC switches to the monitor speakers which are presumably connected to the PC onboard sound.

I'm afraid this sounds to me like a faulty sound bar - you should try it on a different PC.

rqt said:

If he only connection to the soundbar is USB then it has it's own internal USB sound card which is entirely separate from the PC onboard sound. So when the soundbar disconnects the PC switches to the monitor speakers which are presumably connected to the PC onboard sound.

I'm afraid this sounds to me like a faulty sound bar - you should try it on a different PC.

Thanks for the suggestion, I have tried it on my laptop and seem to get some plopping sounds, and other strange noises so it does look as if the soundbar is faulty. I hope I can still return it, even though I no longer have the box it came in.