Welcome in the forum, Otto ;-)
I think it would be more helpful when you post the schematic, I assume that your router would be able to create a corresponding board.
PS: And where in Germany are you located, I live near Bremen.
Well, I am a system designer, not an electronic engineer. So might it be that you tied VCCA to VCC.
Datasheet states (pg 27) do not apply power to the VCCx pins,
This is also shown in the schematic on pg 10.
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Many thanks, that was the problem. I did cut the trace to the VCCA pin and now the internal regulator puts out the correct voltage.