DMM are issuing a product recall, subject to user inspection. The document below details the products that are affected by the recall and contains instructions to identify whether or not an affected product should be returned to DMM.
In a small percentage of carabiners the interaction between the internal coil spring (which gives the gate its closing action) and the gate pusher (the component that holds the spring against the carabiner body) may cause the gate pusher to displace, potentially preventing the gate from closing or the mechanism from locking completely.
This recall encompasses all of the products listed in the PDF. All models, all colours and all gate types are potentially affected by the dysfunction.
The link below takes you to DMM's returns procedure. This details how customers can return their affected carabiners to have them repaired or replaced.