I have had my pool for about 10 years with no real problems. About a year ago I had a problem with a flow switch and got a warning that it was not working. I had some pool people replace it and it broke again and then again. The switch was under warranty and replaced at no charge, but it has broken again. Well, I ordered a flow switch and it worked perfectly for about one month. We had a hurricane (Sally) in my area and had to evacuate. When I returned I had a huge amount of debris in the pool which I emptied. I shocked the pool several times while I awaited my power to be restored. Everything was looking good with no warning lights until a few days later and, once again, the flow switch problem resurfaced. As I said, I had no problem with this for years and then all of a sudden it has become a real issue. What is the problem and what do you suggest?