Awrite guy got a s2 here

spec-

10 psi
bleed valve [think its maybe standard actuator
full ss
supposedly chipped
air filter
standard intercooler

rite heres the prob whn i 1st start it up in the morning when cold its boost's fine but 5 mins later whn its warm it doesnt want to boost and wont and struggles to go anywhere past 4000-5000revs feels more like 1psi boost

any ideas help!!!!!!!!!!!!!!!!!!!