This small (I think 1.5hp) above ground domestic water centrifical pump will pump up to 78psi. As water is used, the pump drops down to 68psi where it then very quickly drops and the pump starts up and goes back up to 78psi. The bladder tank will range from 38 to 45 psi during a cycle. The problem is the quick drop in pressure that lasts for about a second in the house. I know the air pressure in the bladder should be about 5 psi under the minimum water pressure, but if I add any more air, the pump will buck a few times before it starts. I cleaned the contacts. The pump sounds like it is operating normally. It worked fine for the 14 years we have lived here. The motor was replaced about 6 years ago due to lightning strike. Any ideas?