Check all of your drivers. I finally fixed a huge memory leak I was having yesterday because the same Win 10 update backdated my ethernet drivers to a version that ate all of my RAM. If those are all fine you might want to check out r/Windows10, that's where I found the solution to my problem.

I had a crashing issue for a long time, ultimately it was my fault. I overclocked and tweaked my ram timings. Even though it would fly through things like memtest with no issue. However, BF4 would crash every 2-4 rounds. Once I removed the tweaks the crashes went away. The crashes you sound similar, memory stability. If you didn't do anything like that(not many do) have you recently changed any hardware in your PC? like new ram or something?

sounds like the crashes i had on bf3 before i changed my upnp to off.
although i'm fairly sure they fixed that issue with bf4, have you tried opening all the ports? it seemed to fix my join-crash a couple months ago, but i still didn't have w10.