X1 stutter when charger connected

Hi

my X1 stutters when my macbook pro 2012 15'' is charging.

see video in link:
(DL)
https://drive.google.com/uc?export=download&id=1tGAIcxggto-G1UoiEcckpGkLNNG8hr6l
or
(Watch)
https://drive.google.com/file/d/1tGAIcxggto-G1UoiEcckpGkLNNG8hr6l/view?usp=sharing

what can be done? can I take it to a repair shop?
tried different cables, the authentic NI cable gives the best results but still stutters.
doesn't happen with NI Z1.

 

Hi
I don't think it's the X1.
Can you test the X1 on another notebook?
It is probably due to the power supply of your Macbook.
Does the power supply have connections for grounding?