I have a 40/60 pressure switch. I turn on my water and watch my pressure gauge. At approx 50 psi, water flow stops. Gauge continues to decrease and at 40 psi well pump kicks on, water flow returns and all is good. Pump turns off at 60 psi. Increase pressure into empty tank to 2 psi less than switch and problem gets worse, run out of water quicker but pump turns on at 40psi. Any ideas, I serviced pressure tank empty, decreased pressure down to approx 20 psi and am back at square one.