Make sure the flow control isn't open all the way. Turn it down a bit.
Take the solenoid off and remove the white plastic thing holding the plunger in place. Throw the white thing away. Sometimes it keeps the solenoid from closing. I'm only refering to this
SOLENOID
There could be debris or glue inside the valve keeping it open.
Check the programming AGAIN. A B C D programs. Whatever there is.