suggested settings for the Olympus OM-D E-M5 Micro Four Thirds camera [Gary Ayton's photography wiki
unless you are shooting low light action shots where you need a fast shutter speed and a very high ISO, set Custom Menu, Exp/ISO, ISO-Auto Set, High Limit to 800 instead of 1600 or 3200, after all hopefully you are using the nice fast, wide aperture lense...