Question
I have sprinkler system with six zones,after a full cycle i noticed the pressure going on and off very slowly;then i turned zone #1 manually all for heads popped up but to my surprise one head from zone #5 popped up also.
Thanks

Answer
It is most likely that the valve for station 5 had not closed all the way, and was letting some water past, enough to operate the head.  I cant really tell from your information whether you have a pump problem or a valve problem.  Is it a pressure system or a direct pump?