Usually snakes work off their environment about the timing on breeding. Diseases can be spread from one snake to another as can parasites that would cause them to all stop eating. If it is breeding season timing for them they could all be off at the same time too.
You may find this site has helpful info
http://www.kingsnake.com/ballpythonguide/
This site lists vets recommended by others who own herps. Here is the link to the California listings
http://www.herpvetconnection.com/calif.shtml
Hope this helps you!
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