hi wondered if anyone here can help? i have just set up and been out this week doing my first weeks work. i am using a shurflo pump and varistream controller. on my gardiner poles i have the stop switches to turn water of. it seems that if i leave the switches turned of to stop the water for a couple of minutes, usually when going from front to back of house, then when i open the switch i get no water coming out or it stops after a minute or two. the only way i can seem to cure this is to disconnect my poles from hose reel and turn pump of and leave for a good 10 minutes. what am i doing wrong? would be grateful if anyone got any ideas. thank you