meat chick odd symptoms

This morning I found one of my 50 Freedom Ranger chicks (age 1 week) upside down, with his neck craned strangely backwards. When I righted him, he flapped and flailed trying to stay upright, but was unable. He has strength, has no discharge from any orifices, and is not weak. When I checked just now, he was laying on his back with his legs straight up in the air. I again set him right, but he quickly went back to flapping and falling over. Nothing is obviously broken or injured and none of the other birds are showing this behavior. I'm somewhat new to raising chicks, this being only my third batch. Any ideas?

sorry, im not much help, but i am curious what others suggest.

i have found somethings that say it could be to low incubation temps, but that may not be your issue if they are a week old and this just started.
i have seen other people recommend the medicated feed to fix a similar thing
other say to put them in a cup and set it up so they have to stay upright and in 8 hours or so it rights itself...
im not sure....

I remember having dealt with it but it has been a really long time, I'll do some studying, look up Marecks Disease and see if your chickens symptoms match, I'll do some searching to see what we did for them.

What are you feeding them? Do they have access to kelp or other mineral supplements?

Our freedom rangers were really hardy but we lost some cornish crosses from getting to big this year, we had one on its back laying there after seeming to be fine after morning checks. That one got a sharp shovel and was donated to the local predators.

Oddly enough I was watching a webcam of a peregrine nest in Pittsburgh earlier this year and the chick there had similar problems. Kept falling over and spent several days on its back despite the parents trying to right it. when they ringed it they found it was heavily infested with parasites, but I think that was more a symptom of its problems than the cause of them. it failed to fledge properly and was taken into rehab where it was assessed to have neurological problems. Wonder if your chick has something similar?

Might be a mineral deficiency but if it's only 1 of 50, I'd cull that bird now.