Share your experience!
From last 2 days my phone stop responding while playing games.Only way to recover is to force restart but after some time its stop responding again.So what is the problem? I don't like to force restart my phone again & again.
Check if you have certain apps installed such as: Battery saver-app, Task manager, Task killer-app, Anti-Virus-app.
Uninstall those apps and see if the problem is solved
If problem still there I suggest that you do a repair of the phone software via Sony PC Companion:
Click on this link to get Sony PC companion:
http://www.sonymobile.com/gb/tools/pc-companion/
Start PC companion, start "Support Zone", start "Update phone software" and click on "Repair".
Follow the on-screen instructions.
I don't have any of those apps running in the background & i have already repaired my phone after jellybean update.The problem has started just 2 days ago before that everything was normal.
It is from the phone software I think...Jb is not very well optimised.
But i have updated my phone to jellybean 2 month ago than why problem started suddenly now? Why there is no solution to hundred of bugs in jellybean update?
Was there any solution for the bugs in ICS,beside rooting and having a custom ROM?No,there will never be in JB either unless sony really starts to care...
Do you enable stamina mode? Try to unable it, I know it does saves some juices but in my experience, xp in jb's newest update is smoothest if you unbale stamina mode. I don't use the apps exception. I don't believe in that. Lol. Tell me if it works or not.
Yes, i have enabled stamina mode.I don't know whether it saves our battery or not since even after 100% charging it shows me that i have 24 hours of standby left whereas it must be 4 times as per sony.
Try to unable the stamina mode, because it's laggy whenever you activate stamina mode. It may cause conflicts to some of your games while you're playing. It lowers or minimize some features of the games to saves battery that cause conflicts and may lead to not responding of your phone. I don't know if I was able to explain it clearly to you, but I hope you get my point. The concept of stamina mode is to reduce the usage of battery when we use apps or games which may affect the performance of the games or apps and because the games or apps lowers it's activity or perfromance, sometimes it crash or does not respond which lead to hanging or not responding of our phones. Tell if it works or not! Good luck 
I never heard that before that enabling stamina mode lowers gaming performance.What is the source? I will try disabling the stamina mode for a day & let you know the result.