WEBSTER

I have a slight problem which hopefully someone might be able to shed some light on,
When pulling through the rev range it pulls like mad but when the boost gauge reaches 0.92bar it stops boosting instantly and will then only reach 0.50bar and it struggles to reach that it still drives o.k but has no oomph,
If i switch the car off and restart it , it is fine again up untill 0.92bar.
It did do this twice three years ago when i first bought it (allbeit at0.75bar )but cured itself,
i'm stumped so any thoughts you have would be greatly recieved,
Thanks,
P.s my car is a 94wrx wagon (k+n, chip,large bore exhaust it has new plugs and coil packs)

WEBSTER

bttt

swan

Sounds like it's going into limp mode...