Share your experience!
I'm sorry to hear about your experience, but a phone can't crack on its own, in fact, if you check on other websites or other brand's forums, you will see that the number 1 repair is replacing the screen, more so now with bigger screens, if you post a picture of your phone we most likely find the point of impact.
As for your Xperia E has 512MB of RAM Which now a days its not quite enough, it is if you run older versions of the apps, why? well lately app developers have gotten lazy and the apps are quite heavy and require a lot more memory and cpu, there's not much to suggest here.
Keep in mind that this is a user based forum.