Really appreciate all the suggestions - thank you all!!
It seems as if I am having exactly the same problem, when writing emails on my Desk Top PC (Yahoo Mail)
I not only did a Clean Install but also formatted the Disc.
Being a 'one finger' typist, I don't type very fast but Windows 10 just can't seem to keep up.
The Cursor randomly freezes for a few seconds or else starts missing letters, all of which is incredibly annoying.
I have seen this same problem with Edge. Both on my HP laptops, and my custom built ASUS desktop. All updated drivers. I moved the desktop back to Windows 7 because I'm assuming the first gen ASUS drivers are probably flaky. Well that, and it has an NVidia 970 card. I'll clean install that box in another month or so when the dust settles. Whatever the newest version of Chrome is solved all my issues on the interwebs for my HPs. Much like some of these other issues, I'm assuming Microsoft has a few revisions to make to its new browser. Once it's cleaned up I'll be cutting over to it.