I recently had an irrigation system professionally installed at my home (about 4-months ago). Can't wait to use it this Spring & Summer. I have a general question for the professionals on this board: Is it normal for trenches to "cave in" shortly after a new installation (within 2-3 months)? The company that installed our sprinkler system is coming out to repair the trenches, but I wanted some insight as to how often this occurs. Thanks in advance for your feedback.