Rahlquist said everything I wanted but didn't have time to say and failed to elucidate in my earlier reply. Thanks.
@BnEc: The official Pi3 PSU may cure your issues. If it doesn't, at least then you can probably eliminate the power supply as the source of the problem.
@BnEc: The official Pi3 PSU may cure your issues. If it doesn't, at least then you can probably eliminate the power supply as the source of the problem.