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If they are free ranging, they are fine with that routine. If they are in a pen, they won't be able to find enough. I don't leave out free choice for my free rangers. Just my cooped birds. Plus you've been doing it your way all along I assume and you have 3 year old healthy birds, so who knows...

My first thought was parasites too. Might be able to drop off a fresh fecal sample to your vet to know for sure what you're dealing with. That'd be cheaper than a vet visit. Make sure it comes from one of the sickly birds. If you happen to have a microscope, it's pretty easy to do your own fecal...