I am running Build 15063.138 now.
I'll test the Marvell adapter to see if it's improved any on my SP3.
Update: making this post was a little laggy so I think it's not fixed yet but I will probably know for sure by eod.
I just rebooted because of High CPU usage and the fan running due to two tasks; System Interrupts and System. This is the fourth time that happened since first installing the CU and the second on build 15063.138.
There was another anomaly that escapes me at the moment otherwise all is well with things I have used.
One downside to using the USB wifi adapter is, it's a little slower waking from sleep so sometimes I get a momentary you're not connected in Edge coming out of a quiet period but a second later it automatically loads the page (still better than what I was getting with the internal adapter though).
Another is on one of my [Routers the USB adapter didn't see the 5ghz SSID until I disabled Dynamic Frequency Selection](
Why Some Devices Can't See the Verizon FIOS G1100's 5GHz Network (and the fix) • r/HomeNetworking) on the router by changing the channel from auto to a specific channel in the 36-48 range.