Raspberry Pi3 Kodi analog noise

Hi guys,

I currently have a Raspberry Pi3 with Kodi installed, connected to my TV using the analog method,
When I first used it, I noticed the screen flickering/vibrating when in menus displaying text.
Any ideas for why this happens?

I recently changes my setup,
Now I notice a lot of video noice, when having a black screen it’s the worst,
Any ideas?

Before the change I had an analog RCA ccable in the raspberry’s jack port, that cable in a RCA-Scart block, that one in a Scart switch, and that one directly in the TV,
The only thing I changed now is that the Scart switch goes into an Scart-Scart block and that one directly in the TV, but I don’t think that should be a problem, it’s only happening with the Raspberry, the other 2 devices in the Scart switch are functioning as it should.
Any ideas?

Thanks in advance!