Annoying sound from rear door

[iberks]

Hey folks, for a while kind of clunking or knocking noise comes from rear right door when door body is flexing and this makes me literally crazy. I say when flexing because it happens when I go over speed bumps or make a sharp turn. Sounds like the noise comes from a piece which is so close close b pillar or perhaps not from the door, directly from the b pillar. anyone experiences the same here?

 

[pkaps]

Notice some random squeeks also when over bumps, when turning mostly (flexing), around the dashboard, I tink at where it joins the door panels, but only then. Too much plastic, unfortunately got to be squeeky at some point!