Hi All, Brand new to the forums. Thought I'd share a problem (and the fix) caused by the Jellybean 4.1.2 update. First off, my Note was purchased in Singapore, is unlocked, and had recently been updated at the official Samsung store with whatever the firmware was prior to 4.1.2. It was working great, no problems. I got the notification of a firmware update last week, and installed over the air with the 4.1.2 update. Immediately, I noticed several problems: 1. The power and Home buttons would become unresponsive. The phone would behave as if it had powered off completely. Hitting them multiple times would finally get the phone to come to life again. 2. Extreme battery drain. Phone began eating batteries in a few hours. 3. Random messages saying that the SD card was dismounted unexpectedly. Apps like Neutron Music Player stopped recognizing the MP3 files on the SD card. Here's the fix: Evidently, Jellybean needs to make some type of change to the directory structure used on the SD card. It tries to do this automatically, but if the card is pretty full, it can't. Since it's hitting the card constantly, it's draining the battery, and when it runs out of space, it dismounts the card and tries again. Pull the card out. Check the behavior of the phone. If the problems go away, try backing up the card to your computer via a card reader, then re-insert the card in the phone and format it. If the behavior goes away, then start copying your media back to the card. This just fixed a week of nightmare performance issues. Hope it helps you.