By "try again" they mean "try teleporting to the instance again".

There's an icon in the lower left corner of the minimap that you can click to try teleporting to the dungeon again. No need to drop group and look again.

"'There's a rounding-error bug in the camera driver's autofocus routine (which uses a timestamp) that causes autofocus to behave poorly on a 24.5-day cycle,' said Morrill."

Cool! The device will later be fixed to properly behave poorly only every 24.45 days!