Lately I have noticed that "Android System" has been constantly using 90-100% of my CPU, causing lag and battery drain. At first, a reset fixed the problem, but now even that doesn't help, even with a battery pull. I have noticed Android System jumping up my "Battery Usage" list higher than in the past. I cannot for the life of me figure out why Android System is taking up so much of the CPU constantly. I've tried turning WiFi, GPS, background data, auto-sync, etc. on/off, but to no avail. Can anyone help me figure out what to do? Is anyone else experiencing the same problem? What could be going wrong? I'm not rooted and I do not have a task killer. But I do have Watchdog (that's how I noticed the problem), which repeatedly gives me notifications that Android System is detected above the threshold level for the CPU monitor.