07-16-2013 04:50 PM
Hi and Welcome to the Community!
Anytime random strange behavior or sluggishness shows up, the first thing to try is a proper reboot:
See if things have returned to good operation. Like all computing devices, BB's suffer from memory leaks and such...with a hard reboot being the best cure.
07-17-2013 09:33 AM
Is there any settings changed.
I have no way to tell you what settings you may have changed. Only you can know what you have done.
I recommend that you attempt to boot into Safe Mode:
It may take you multiple attempts to get the ESC key sequence (press/release/hold) correct, so be patient. When successfully into Safe Mode, see what happens.
If the behavior ceases, then think carefully...what happened just before this behavior started? A new app? An update? A Theme? Something else? Think carefully as the smallest change could be causal...and attempt to undo whatever that was.
But if the behavior continues in Safe Mode, then you may need to consider more drastic actions -- WIPE, OS Reload, BBSAK Wipe/Reload, and the "Bare Bones" OS Reload Process. To prepare, you should be sure that you have a full backup to your PC...please review the Backup link in my auto-sig on this post for instructions.
You may also need the use of these tricks:
Of course, if the problem is a hardware failure, then no amount of internet-distance diagnostics nor OS/software level fixes will be of any value.
Good luck and let us know!