Personally I think that it might be "the update" process, installing a build over top of a build, over top of another build that's producing some of the common annoyances that many are experiencing.
Trouble, I agree some of the current situations could be caused by prior builds/installs.
I just installed 10122 cleanly on my OLD Dell Inspiron 1545 laptop and guess what. The Updates are still showing as needing a reboot.
Cortana is still not behaving correctly. But when it comes to Cortana, does anyone know how it is supposed to behave? Currently, it is not showing me the "Listening" response even when I click the Microphone icon. It is responding by opening a small window but I have to type any question. I have seen it respond without opening a window at all and by opening the full window. If I knew exactly what it was supposed to do in certain circumstances, I could compare that to what I am seeing.
Edge is having small problems even with the Microsoft forum if I try to bold a word, all the words after in the same paragraph will be bolded. Not a big deal of course, but shouldn't at least the Microsoft site be keeping up?
I just downloaded the 10125 build I will try later. I got mine from a torrent site, which is why I put Windows 10 on this laptop. I will post back later about how it goes, although it doesn't sound like there are many changes. I suppose they have not yet released 10122 to the slow track so it might still be a while until another new build if officially released.