clicking noise coming from passenger side rear as car flexes???

My 400 is making a really annoying click noise everytime the weight shifts in the car ie accelerate, brake, turn left or right as the body flexes.



It sounds like coming from rear door so took into work to make sure hinge bolts tight, check strap tight etc... all good and cant recreate noise with doors open. opened boot and wiggled about, no noise and all tight.



The noise is equivalent to gently tapping bodywork with a screwdriver but is very annoying as it does it constantly!



Going to jack the car up and check all the suspension tight but wandering if its a common problem? Anyone else got this noise?

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