I'm sorry to hear that you're having to deal with this frustrating issue as well, but I'm also glad to know that I'm not the only one experiencing it.
And yes, today, my lag began at around 1:30 PM and lasted all the way until 11:15 PM. Graph here: »i.imgur.com/91fTXty.png
I have never seen it begin this early, so this is quite concerning.
Now that I have confirmation that I'm not the only one with this issue, I might try to be a little more persistent in getting them to fix it. Before, I wasn't 100% sure that the issue was on their end, and I didn't want to look like a fool if I repeatedly harassed them for something that wasn't their fault.
Let me know if you make any progress in getting them to acknowledge/fix this. Thanks!