I've never experienced that, but I have a couple of exercises that may help you lessen the occurances. For the next few times you are lucid, don't try to force or control anything.

Walk around and examine everything in as much detail as you can, look at things, pick them up and feel their weight and texture. See if the feels hot or cold to you. Just take in as much sensory input as you can.

HOWEVER, do not try to overly analyze anything or attempt to change it in anyway. Appreciate the world of your LD, feel wonder at its realness and beauty.