The Canon S100, primarily known for its great point-and-shoot abilities, is being recalled due to a manufacturing problem that causes the lens to get stuck while it is extended. To find out if you have a faulty model, you can just check the serial number. Any serial number beginning with 29-41 fall under the faulty model category.
Canon explained that certain S100 models are susceptible to the lens error that is caused by a disconnected part within the lens. The part will come loose when exposed to high temperatures or humidity. If you are suffering from this problem and Canon can confirm it, they will repair it for free. Head to Canon website below if you are experiencing the lens problem mentioned above.