My regular uptime on Samsung Galaxy S2 was around 6 days. For the last couple of weeks it is down to less than 3 days. The change was instant, but I was hoping it would come back - it did not. Running ICS 4.0.3 from Samsung. No change of activity - I primarily use my phone to talk, no games, browsing etc. I installed System Tuner, looked in the system log and found this event happening every second or so: "DrReadUsbStatus returns false USB is offline" Similar problem on the internet:
According to some sources, it could be causing battery life issues.
Samsung suggest a hard reset - trying to avoid that at all costs.
Answer
The error seems like something regular. A Google Search reveals many places it is mentioned (with a logcat), but almost nowhere it is commented on -- except for GALAXY W Constant Error in Logcat (XDA).
A shame they removed the wakelock stats from *#*#4636#*#* service menu (which would have offered you a quick way to check) with Gingerbread and up. You might want to look for some monitor app on the market (there's e.g. SystemPanel which might prove helpful) to figure out what keeps your device awake.
In case this app doesn't provide the required information (I already mentioned Wakelocks being the most probable cause), there's another useful app: BetterBatteryStats (also mentioned in the XDA-Link) seems to bring back Wake-Lock stats. As a short and eased-up explanation: An app might request the CPU not going to sleep, but still not actually use the CPU, though - the Android PowerManager API provides an interface for this). So BetterBatteryStats should help you find the responsible app:
For reference, here's the link to the BetterBatteryStats Thread on XDA, including the App (and its Changelog) as well as some closer explanation, especially on Wake-Locks.
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