I have 5 hens about 2 years old,am only getting 2 eggs a day,have found very soft shell in boxes at least 4 times a week,have also found several tiny eggs,what is going on and what can I give them to get them back to laying again,also inajoining pen I have 3 hens ,just turned a year old in may,am only getting 1 to 2 eggs from them.any suggestions on what is going on thanks