Unfortunately, it could be that you have Mareks disease in your flock. Some can get a transient paralysis, then appear to get better. Wasting away is common in Mareks. Limping can be from a symptom of injury, disease, and this could be unrelated. And your others could have just had coccidiosis or something else that made them weak and not walk. You probably should read some of these links about the disease:
http://partnersah.vet.cornell.edu/avian-atlas/search/disease/502
http://extension.unh.edu/resources/files/Resource000791_Rep813.pdf
https://www.backyardchickens.com/a/the-great-big-giant-mareks-disease-faq
http://partnersah.vet.cornell.edu/avian-atlas/search/disease/502
http://extension.unh.edu/resources/files/Resource000791_Rep813.pdf
https://www.backyardchickens.com/a/the-great-big-giant-mareks-disease-faq
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