if the screen flickers when you turn the marker on you may have some dodgy batteries
if not
could be a few things
Solenoid Flow Restrictor (SFR) set too low
SFR assembly is blocked
Training Mode is enabled
Inline regulator is supercharging
Dirty body filter
with it being a planet gun just completely strip down the marker give it a good clean and lube follow the manual see if that sorts if not maybe send it to planet or see the planet tech at an event