Reboot randomly My Xperia Active (Android 2.3.4) which I bought this year keeps rebooting itself at random time. It keeps happening when I'm on multitasking, when it's in standby mode or even on call. I thought it might be the system failure, system crash or something. So, I clean up my phone, scan for viruses, monitor the running apps.. yet it's still happening. It's really irritating me. I hope you can provide me the solution. Thanks..

SOURCE: Sony Ericsoon M600i Crash Restart to increase performance

It seems your phone is running out of memory. M600i comes with 60 to 80 MBs internal memory. The phone treats larger part of the memory as RAM. And UIQ3 the OS on this phone retains the applications in its RAM once it is opened till you go to Task manager and press exit program. Thus, phone has no other option but to restart to free some memory and show the above message. In your case as you've said the phone restarts after few seconds try this as soon as it starts and home screen appears:- 

• press (use the jog dial {wheel} and the star key) >*<<*<* (thats:- up*down down*down*) service menu will appear 
• choose format/restore phone settings whichever applies to your phone enter the security code by default it is (12345). It will format the phone's internal memory which is also used as RAM in M600i. The error message "the phone was restarted to improve performance" appears when there is no more free memory left in the phone's internal memory. Try this and post the result.

SOURCE: my phone keeps shutting off

Try updating the software on your phone... Directions for this can be found on the sony ericsson main website..

Sony ericsson phones usually start giving problems after some use, and replacing the software usually takes care of the problem..

regards

SOURCE: xperia x10, at&t service, keeps

HI donsheppsrd take the batttery out of the phone. first and the take the memory card ot. Now put the memory card back in the phone. The phone should start back up. IT sounds like you have too many applications running on the phone and the phone's memory is full. Go TO THE DROID MARKET AND DOWNLOAD ADVANCE FREE TASK MANAGER . Once you download the free task manger it the blue label one. You will need to go to and have it stop all open running programs. This should help you out a lot. Ok if your still having problems after all this I want you to take the phone to your local provide to see if they can help you.

I’m happy to help further over the phone at https://www.6ya.com/expert/ronald_e152e07e272e4f27

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Did you fix the problem? I can't turn flight mode off either