upgraded to android4.3 got lot of problems

[arunsai]

my phone model is xperia m(c1904).Before upgrading to 4.3 i,my phone was fast and all the apps run smoothly.After upgrading my phone ,it became slow and apps crash after 1min or few seconds sometimes screen goes off while i'm using my phone.and my battery is draining too fast plzz fix it

[Johan]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

I suggest that you to run your phone in safe mode for a while to check if you still experience this. If not this may be caused by any downloaded application.
How to boot into safe mode?

If not, you can try to reinstall the phone software using Update Service..

Before reinstalling your device you may want to backup your information first. Check out this topic for more information on how to.
How to backup?

If the issue should still remain I think that this needs to be examined and fixed at a repair center. For more information about how to submit your phone for repair and where, contact your local support team.

[samkkr]

check if there are too many useless apps running in the background due to which ph becomes slow refresh the memory dnt install too many apps and the screen going off is u need to adjust the screen timeout in settings, battrry drainage is common here even mine drains real fast even right after charging