"We are aware of some customers reporting a scenario with their Surface Books where CPU speeds are slowed", a Microsoft statement reads. This update contained a new version of Marvel Wi-Fi driver, which is what could be causing these Wi-Fi issues. The consensus is the problem is being caused by the Intel CPU flag BD PROCHOT, a feature that can be used by any peripheral that's created to throttle the CPU to maintain system temperature at a safe level and avoid overheating. However, the reports suggest that the firmware update hs caused serious CPU issues after the installation. As noted in a Reddit thread, Microsoft Surface Pro 6 and Surface Book 2 users are extremely frustrated with their devices experiencing the problem. Some users report that the issue is resolved after disconnecting the Surface Dock or AC adapter while others blame a third-party antivirus software behind the slowdown. Just keep an eye out for a fix from Microsoft. You can use throttlestop to disable it from throttling your processor. Unfortunately, it also means that thermal throttling won't be working as normal.
Microsoft has had several issues with its Windows 10 updates in the recent past. Further, throttling down to 0.4GHz is extreme and makes the devices nearly unusable. "We are quickly working to address via a firmware update".
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This fix is a lot easier.
In the meantime, you can disconnect and connect the charger once again.
"If you have Wi-Fi issues on a Surface device since the updates earlier this month, you can simply roll back the driver in device manager, which will restore access to 5GHz networks".