Camera Manipulation Help

Can someone explain to me whenever I tween the camera to a different position, the camera shaking stops? How would I make it so that the camera shaking continues?

Here’s what it looks like:

You could use a for loop for the shaking, and have it as a function.

function shakeCamera()
       for count = 1, 5 do -- start number, end number (how many times the loop runs)
	       -- Shake camera