Ok, your os is the correct one. The only thing that makes a screen unresponsive like you have described is a memory drain that I am aware of, other than a defect which is most likely not the case since it worked ok before. Do you have installed any new apps, such as a screen lock program, or a live web oes which is constantly searching for updated news, weather etc.. Also, I know you did this already, but try a battery pull with device off. Leave it out for a minute or so. When it resets, go to options again, then memory. Tell us at the bottom what is the application memory free show. Then when the phone gets sluggish, do it again and see how much of a drain there is. Report back with results.
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