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Hello, when you lose power do any warning lights come on?
What does your boost drop down too? What is the current temp outside?
I'm going to guess the fuel level isn't low? No abnormal noises just no power? No codes stored in memory without a check engine light? A faulty EGR valve could cause this similar issue.
Do you hear a loud air leak by chance? I would visually inspect the CAC tubes for a leak. Are they ok?
Does this have a programmer installed by chance?
This is a hard without a code to go off of. It sounds like the vehicle needs to have data watched in order to diagnose. If the thermostat is opening to soon it can affect engine operation. Another thing is the EGR valve is opening or sticking open you can have this issue.
The VGT may not be working correctly. Can you monitor data.
How did you test it?
If all of those items are ok I suspect you have a fuel related concern. If there is an issue or a calibration issue in the PCM you can have these concerns.