The solenoid adjusts the boost, from 7psi on the actuator, to 14psi when bleeding pressure off. If the ecu sees cold water temp, overboost, knock and plenty of other errors, it will lower the boost temporarily which is what you are seeing. If you don't want it to drop boost, just bypass the solenoid, if you want to find the cause of the error, you will need to get the ecu read on a consult 3 unit.