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Without seeing FASTA or live data, it's hard to say, but I would lean towards wastegate solenoids.
This kind of fault usually manifests itself when everything in engine compartment becomes heat soaked and those actuators start behaving funny. Everything within controller feedback loop might seem within spec for electronics, but actual boost deviates from the setpoint and is thus disabled/degraded.
EDIT: From another thread I see that you run some kind of tune on your engine. This might very well cause your issues.
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