The Surface devices have been plagued by various problems since Microsoft released them.
But now there’s a new problem with the gear.
Microsoft Surface Pro 6 and Surface Book 2 are throttling down to 400 MHz.

you’re able to get more information from theMiniToolwebsite.
Surface Pro 6 and Surface Book 2 are throttling down to 400 MHz.
In some cases, this state persists during the reboot.
It seems that BD PROCHOT an Intel CPU flag causes this Microsoft Surface devices throttling issue.
The BD PROCHOT flag is neither unique to Surface devices nor new ones.
It is difficult to determine what component is incorrectly setting BD PROCHOT.
A Microsoft spokesperson says that the company has noticed some customers reporting CPU slowdowns on their Surface Books.
Microsoft is working quickly to fix the problem with firmware updates.
Since their launch, these devices have been plagued by various software or firmware related problems.
In contrast, Surface Book and Surface Pro 4 often dont wake up from sleep mode at all.
You see violent display flickering on the Pro 4.
Surface Pro 6 and Surface Book 2 are throttling down to 400 MHz.