Silly as it sounds, run some baking soda/vinegar mixture down your sink drain. The DW is connected to that drain and it could also be that your just noticing it more in the DW. Pour the old baking soda from your fridge down the drain then follow it with the vinegar. It will foam in the pipes and help clean them out. If you also have a garbage disposal, quarter a whole lemon and chop that up followed by some ice cubes in the disposer. Have everything smelling fresh in no time.