I'm using the ATT SGH-I337. It's now been 11 days since I've been on 4.4.2. I did my upgrade OTA, up from 4.3, which I had been on maybe a month or so by that time. I backed up everything, took screenshots of my homescreens, etc, removed the SD card, did a factory re-set, then did the OTA upgrade, then factory reset again. Over the next day I made sure to periodically pull the battery and leave it out for at least a minute or two, then put it back in, just to make sure. Since then I've only had that one issue with the blank screen, which I rebooted afterwards, and haven't seen it since. I've also seen my battery life increase significantly! Check this out!
That's 35 hours! I pulled it off the charger yesterday morning, let it stay unplugged all night, it was about 50%, popped it on the charger for the 10 minutes I ate breakfast, (that explains the little bump in the middle), and then took this screenshot a few minutes after getting home from work, just before popping it on the charger. Before the upgrade I would be somewhere around 40% by the end of the evening, so I would pop it on the charger. I used it as I would normally today. Some phone calls, some emails, some texts, some IM, web surfing, and uploading and downloading pics to my google drive. So I have to admit, I'm very surprised that there are so many problems. I even have about 50 apps that I've installed via the Play Store. I still think that doing a factory re-set both prior and after the OTA update as well as pulling out the SD card during the upgrade is what worked for me. I know I used to do that on my old Blackberries when I used to update the OS's on those, and it always worked fine.
capT