It seems that there is someway to alter the time setting without asking for confirmation. This has occurred twice: 1) the setting was changed from 20m 3x30s to 0m 3x20s and 2) the setting was changed from 10m 3x30s to 5m 3x30s. These are not default time settings so it seems this is a case of someone manipulating them and not me just accidentally selecting the wrong one.
Has anyone else experienced this?