Can someone please give us some advice? I am writing this for my husband who is outside digging up the back lawn and probably swearing. We have two parts to our watering system. The first part works fine. It involves just two sprinkler heads that water two small flower beds. No problem there. Then when that cycle is done the next cycle starts up. Five pop-up sprinkler heads appear and attempt to water the grass. Only these sprinkler heads don't spray like they used to--in large overlapping circl...