I have a well on a piece of property in the desert. I have replaced the pressure switch. The symptom is that when I first turn on the water after having it off for 10 minutes the water gushes out quite well and then slowly begins to lessen until there is little flow. About every 20 seconds or so there is another gush that rapidly lessens to little flow, and this then continues. Is this as simple, but expensive, as the water table is too low? I hope someone tells me something else. Please. Thanks in advance.