Share your experience!
I bought Sony xperia tipo on 5-11-2012, after 20 days it started giving problem with touchscreen
If the problem can't be fixed by a software reinstall using SUS.
http://www.sonymobile.com/gb/tools/update-service/
I suggest that you contact your local support team to have your phone examined and fixed.
http://www.sonymobile.com/global-en/support/contact-us/contact-info/