Sony A7R V extreme microphone line noise(unusable audio)

[cinges]

Hi, I have a problem with huge loud line noise when using external microphone with my A7R V. I also have A7C II and there is no problem at all. I saw video when a guy have workaround on his A7 IV, when he switch modes from 2 to 3 and then back and then is audio okay. Unfortunately this is not working at all on A7R V. Any ideas how to fix this issue? Audio from external mic is then absolutelly unusable (I tested all mics, audio from zoom, problem is same). Here is a video https://www.youtube.com/watch?v=V0plZcW3sfk

Thanks for any help!

[danardeng]

Seems that the charging device you are using is putting souch noise... is possible?