I have a pentair two speed pump that I usually run in low speed. Due to some urgency I am now running in high speed. The problem is starting up in high speed causes a bad sputtering noise and shaking. It stays at about 2 PSI and will never go to a normal run. If I start it up in low speed and then switch to high speed it is fine. Also, if I am running in high speed and then cut the power, but immediately turn it back on it is also fine and running at 12psi

May it be due to a leak somewhere in the system causing a loss of pressure?