[SOLVED] Moode on my Raspberry Pi 3B, shows undervoltage

[srmood]

Hi,
I just found the problem.
I replaced the extension cable from de adapter plug to micro-USB (which was included) with another extension cables: from the adapter plug to USB-A (which also was included) and another extension cable from USB-A to micro-USB (which I had in my drawer) - and no more undervoltage messages.

So it turns out the first extension cable is faulty.
Problem solved.

Thanks for your thoughts.