Composite door "shudder"

[DIY fan]

No amount of extra fixings will make a difference (assuming he has done the recommended 600mm fixing spacing when joining the frames).
This is due to the flex in the 3 separate frames and the aluminum couplers.

I have the exact same problem

Front Door with two narrow side panels in glass. The door is fitted properly and strapped at 5 points overhead but there is still a shake

I have not rendered the outer reveal overhead yet, so I presume I will need something like this, which is strong but flexible enough to prevent cracking?

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I will also need mesh I presume

This would create a solid front for the doorframe to press against. On the inside, I may consider angle iron fixed up to the lintel across the width of the frame. This should prevent any play or movement?

 

[robinbanks]

What problem does it cause? Does the wind shake it audibly or is it just the few times a day the door is used you notice a flexing?