This happened after I started hardening off. They were out for 3 days, for a total of only a few hours. There was some wind blowing. They are back in the greenhouse and they seem to be recovering. Thanks
Here is a link that might be useful:
Gorgar, I'll respond in the main forum where you also posted this. It's really not a pest and disease issue...
thanks for your response. I also posted here because it was suggested that I also post here. Thanks