My zones have a difficult time staying on when turned on. Sometimes it takes five minutes to get them running. I replaced solenoids and checked for wiring issues. I asked a neighbor who had same box and they had to have a new controller installed to solve the problem. I found this link about my controller box.
http://www.lawnsite.com/showthread.php?t=285202
It kind of stinks because I was hoping to replace it myself with the same box so that I could see where all of the wires go and hook it up exactly the same as I take it down. If I go with a different box I am not sure that I will install it properly. Maybe I'll try to buy the junk New Richdel 446 pri. It should hopefully last five more years before it wears out again.