I have another post that I discussed the system turning on when I close the lid even after I have pressed the power button or it has just naturally gone to sleep.
I have been concentrating on making sure the display and the unit goes to sleep. I fully charged the Xoom from a completely dead battey. With absolutely zero use the device completely drained in less than 2 days in sleep mode. Before the 4g and HLK75D update, I had not used the device for like 5 days, and the Xoom still had a quarter battery life!
The very same thing happened to my Samsung Fascinate phone when I went from 2.1 to Froyo 2.2 (which was 6 months AFTER everyone else got it). The 2.1 Fascinate could last between charges and day and one-half; 2.2 Fascinate could barely go 6-8 hours, even with every known setting tweak and/or turned-off.
I have tweaked the Xoom to all that I can do. I have performed both methods of Factory Reset. I have even changed the setting to use just CDMA, however, I primarily (as in almost always) use my Wifi at home, and wifi via Hotspot at work (work pays for hotspot :-] ) I wanted to test the 4g last night so I took the device into the big city - but it had already drained since I had just fully charged it less than 2 days ago. I was very surprised, and disappointed.
I 'chatted' with Motorola the other day, and they just gave me the link to manage battery life, all which I have already done. Love the device, but am very disappointed with the battey life that went from great to dismal.
Sent from my Xoom using DroidForums