First time pool owner. Water tests seem ok. I shock at night and turn the pump on. When I get up the next morning the pump has shut down. The pump is only 3 months old. I changed the DE about 2 weeks ago. The gauge is running around 14. It goes up to 20 every few days and I have to bump it to get it back down. It seems like it will only run around 5 or 6 hours before shutting down. Any help would be appreciated. Thanks