Not sure why this one was closed {...} It isn't about "use of an electronic device"
I understand this situation can be annoying. However you are using someone else's device i.e. that audio amplifier board, as it's something you bought & didn't design.
Effectively, the question is asking people to (a) reverse-engineer that device from the photos; (b) gather enough information to understand what is happening; (c) then suggest where and how to fix the problem.
This type of question is very difficult to answer remotely, without a schematic, datasheets and scope traces (aka oscillograms) - as a minimum - so you will also need to have (and be comfortable using) an oscilloscope. That is why (long ago) the site decided questions on using devices were off-topic, since the required design-level information is not provided to buyers and therefore can't be provided by them as part of the question.
Can I improve the question in some way?
Yes - (a) if you added the schematic for the board, as well as links to datasheets for all relevant devices, especially the Bluetooth SoC in the bottom-left corner of that PCB photo, and (b) confirm that you have an oscilloscope to be able to trace the audio signal & power rails through the board, then the question could become (IMHO) a reverse-engineering question with perhaps enough information to be on-topic.
Unfortunately Amazon Marketplace product pages (and Ebay & AliExpress listings) almost never provide the required level of information for non-trivial boards.
Even then, depending on what initial scope traces showed, it may still be unrealistic to diagnose remotely (there can be lots of iterative work needed e.g. the next step depends on what is seen in scope traces gathered in this step, wash-rinse-repeat, and depends how well-equipped your lab is in terms of what mods you can try etc.). It would likely best be done in chat (so that scope traces & other images could be viewed "inline") and would require lots of commitment, from everyone involved, due to the days / weeks of to-and-fro messages that would likely be needed.
Sorry this isn't what you'll want to hear. It's one of the problems of buying products from Amazon Marketplace / Ebay / AliExpress etc. I do occasionally buy stuff from those places, but I always assume (a) some of the components may be counterfeit; (b) it may not be safe or meet relevant standards; (c) I'll have to reverse-engineer the thing myself, to understand it and (d) I won't get any support for it from anyone else, including from the vendor.
