My RIR or BA, not certain who, laid a very soft shelled egg that got stepped on and torn. She has laid perfect eggs since she started laying 6 mos. ago. Might stress have caused this? I was working on their coop with an electric staple gun yesterday while they were in a small run less than 20 ft. away. When they were returned to their coop it had been changed (door removed and space covered w/ hardware cloth for the summer). Can stress affect chickens in this way?