This is probably what I was being told when an 18-200 II was mentioned.
So for the 8 people that own this lens (Sorry Canon), you can get it fixed for free.
22 February 2011
To: Users of the EF-S 18-200mm f/3.5-5.6 IS interchangeable lens for Digital SLR Cameras
Thank you for using Canon products.
We have discovered that some EF-S 18-200mm f/3.5-5.6 IS lens products may have screws that come loose inside the lens and which may interfere with zoom operation of the lens. We would like to convey the details and our service policy.
We offer our sincerest apologies to customers who have been inconvenienced by this phenomenon. Canon always strives to provide the highest quality products to our customers and we spare no effort in our quality management to make sure our customers can use our products with confidence. We hope our efforts will earn your understanding.
There are cases in which the zoom barrel gets stuck and stops moving during zoom operation.
Digital SLR camera interchangeable lens “EF-S 18-200mm f/3.5-5.6 IS” Serial Numbers 450ｘｘｘｘｘｘｘ to 631ｘｘｘｘｘｘｘ
The products with this phenomenon will be inspected and repaired free-of-charge. If you own one of the affected products, please contact our customer service hotline. We appreciate your patience, and we offer our sincerest apologies to the customers using these products who have been inconvenienced by this issue. Our free repair service will start on 22 February 2011.