Pelagic Pressure Systems is recalling about 2,800
Oceanic and Aeris digital dive computers due to a
decompression hazard. The recall is for Oceanic-brand
Atom 2.0 dive computers sold between August 2006 and
February 2007, and Aeris-brand Epic dive computers
sold between October 2006 and February 2007.
Two German divers found that when switching from
  one gas to another during a dive, their dive computer’s
  display locked up and did not return to the main dive
  screen showing dive times. That lack of info could cause
  divers to ascend prematurely and risk the bends.  
Serial numbers for the specific dive computers to
  recall are posted on websites for Oceanic (www.oceanicworldwide.com) and Aeris (www.diveaeris.com). If you
  have one of these, take it to an authorized dealer for a
  free software upgrade. You can also contact Pelagic’s customer
  service department by calling (888) 854-4960, or
  e-mail service@oceanicusa.com.