I have an ongoing support issue with Nokia Resolutions, and this was part of my e-mail to them on Christmas day:
Many people have complained about a reboot problem, but I've only experienced it once shortly after the Portico update. However, just an hour ago, I could not turn on my phone (last used an hour before that). I thought maybe I drained the battery, so I plugged it in and waited. Unfortunately I got no response, so I tried the 2-button reset.
After the phone turn on, I noticed my Weave and BBC live tiles disappeared (and those are my only live tiles). Not only that, but it appears I have lost part of the Portico update. I am now having Update 8.0.10211.204 (KB 2788412) available. I checked a bit, and see that I still have the keep WiFi on option, but lost the text replies to incoming calls feature BUT still having the settings available under Settings > Applications > Phone.
Up till now, I am still facing a lot of the phone-shutting-off-need-reset problem. At least once a day. But the tiles no longer disappear.
Btw, disregard my comment regarding text-reply not working. I wasn't aware that it only works for numbers in your People hub.