CM870 turbo issue

[Koren]

Hi, everyone. I'm having a problem with my turbo, can't figure out what is it. It's a 07 Volvo with CM870, demandated.
At first when you accelerating or driving uphill, my turbo pressure gauge starting to fluctuate. This video shows exactly what happens
https://youtu.be/jEIXuIyDlw8
I checked the codes and this one popped up: Turbo Speed, Value too low, active, MID 128 PID 103 FMI 1
After a couple of days it become worse. At some point the pressure won't go more than 15PSI, but the fuel data at the moment shows around 4.9MPG with full throttle (which usually is 2.5-3.0)
Then, somehow it goes back to fluctuating mode with the pressure goes up as much as 35PSI. And then, after some time - again to 15 with power loss but increased fuel mileage.
On top of that - another code pops up: System diagnostic code #1, Electrical fault, number of events 39. MID 128 SID 151 FMI 3.

Turbo is less than 1 year old and still under warranty. Anyone have any idea what is happening?