Timer problem...sounds like the board is going bad....sounds like bleed..meaning that when zone 1 is on some power bleeds to the other zones causing them to have small amounts of voltage..not enough to kick on the solenoids...causing them to try and open...call rainbird...do a google search and you can get their website..then their customer service number. Good luck.
Sprinkler Solutions, Inc.
Arizona and Colorado
www.sprinklersolutions.net