Recently I have been suffering from various battery issues ranging from fast battery drains to unexpected shutdowns at safe battery levels. But most striking is the fact that I lost all system data (like system app data, WiFi Access points, etc) after my most recent shutdown! The strangest thing is that i have not lost any data of any non-system apps!
I guess my question would be: Can a shutdown due to critical battery cause my to lose only system data? If yes, how did it happen and how can i prevent it?
The Shutdown: The shutdown involves a short flickering of the screen (in a rare case it also made a soft high pitch sound with a very soft pop) followed by the screen going completely black! All happening within a fraction of a second right in the middle of an app without any warning or prompt making it less like a typical shutdown and more like a crash!
Also worth mentioning:
- After the phone freezes sometimes, I force a restart and after powering up the battery would have dropped up to 30% (that makes a 30% battery drop in under 2 minutes!)
- The frequency of these shutdowns increased after using a battery hogging app (EveryCircuit)
- I have 2 Samsung Galaxy SII batteries which I occasionally exchange
- I once kept my phone for charging at 3% but instead it discharged to 0% before the charge began to climb
- (Edit) I have not overclocked or over-volted any hardware manually, but I have for a short amount of time under-volted the 200MHZ power state as an attempt to save battery (but I cant say whether the ROM itself has done any Over/Under-Clocking/Volting)
Things are starting to get hilarious with my phone! Any insight is appreciated!
- I have a rooted Samsung Galaxy SII (18 months old)
- Running Kitkat ROM (CyanogenMod 11)
Similar symptoms addressed here