GPRO 10Black Dud product. No support No exchange R10K down the drain

I had Hero10Black for 4 years bought for my wife. She struggle with it going off after few seconds or 30 seconds max. I paid abour 10 to 12k for it. Found she stopped using it. upgraded firmware. no luck. It is a dud! No luck replacing or getting it repaired. My query to Support at GoPro. com Support sits there with no action taken! What to do, please help. We are being ********** by poor support and bog name companies. Rsther buy a cheaper Chinese or Japanese version with support,!