I have a RIR sex link hen that is about a year old that is brooding again. I have a total of 7 hens and no roosters. I have had chickens for about 5 years and this is the first time I have had a hen that is brooding. I have tried all the tricks (moving her out of the box by hand, placing frozen veggies under her, and finally putting her in solitary confinement). I have separated her out and put her in an elevated cage for 4-5 days. This seems to break her and I join her back with the other hens. She does well for about 3 or 4 weeks and then she goes back to brooding again. We have gone through this process 5 times now. Anyone else experience this or have any suggestions?