Before the Portico update, my L920 froze up (almost always with the screen on) maybe once every few days, no more than 2-3 times a week I'd say, sometimes less. Oddly enough in the day leading up to the update and the day of, I had about a dozen freezes, dealing with email (Gmail and Exchange), web browsing, but most often, using Nokia Drive + (no bluetooth).
After the update, I've noticed that I haven't had any freezes while the screen is on, but it's pretty much guaranteed now that my phone will hang sometime overnight while charging. I actually was late to work one day because I use the alarm on my cell and it just didn't work.
Anybody else having similar problems? I went back and checked and I actually haven't installed any new apps or made any changes to my phone / settings in about 2 weeks, so I don't think it's some rogue app that's doing it (although it could be something that was udpated in that time). Is it at all possible to remove this update to see if it helps?