Yes, I've noticed the same thing. When using punctuation, if I add a comma and then a space I have to tap ABC twice to get the alpha keyboard back up. If I want to enter a number next, I discover I've typed a letter because the keyboard is in alpha mode without switching the view. Very frustrating.
I also really, really hate the layout of the keyboard. Why can't period, comma and apostrophe be on the main screen? I use commas and apostrophes just as much as I use periods, or very nearly as much. Bleargh.