I have a couple on the bench for testing. I typically run 5V and testing several elements I run out of 5V ports...so 12 or 24V and a china buck or two works for more 5V ports. Mine seem to have very hardy components.....they keep going. On the bench they are great, but too inefficient and too low of current load capability for me in the field.

Yeah, your issue may be counterfeit to fail like that.