The past weekend, my droid X (stock, unrooted) automatically updated (now at 4.5.621.MB810.verizon.us). Around the same time, I noticed that my battery was draining far more rapidly than is normal. Typically it can last 1-2 days of normal use, often even longer. Following this update, it would last 5-6 hours before completely draining, even when sitting idle. When looking at battery usage "android OS" accounts for 98% or so of the usage, something that has never been true in the past. The phone additionally gets warm to the touch. I've tried battery pulling, which made no difference, and flushing the cache, which somehow briefly eliminated the problem for about half a day after which it recurred, and subsequent cache flushing made no difference.
To eliminate the obvious, I have no taskkiller and this is unlikely to be a failing battery as the onset of this problem was very abrupt and correlated with the OS update. Wifi and GPS are not turned on, and with juicedefender installed at aggressive there was no difference in rapid drainage making it unlikely in my mind that some rogue internet, gps or wifi process is at work.
Has anyone seen anything like this before? If so is there some easy solution? Failing that, is there any way for me to further diagnose the problem?
Thanks in advance for any help.