My Galaxy S4 is just a few weeks old, and I really am happy with the phone. It's a great device. One behavior that strikes me as odd is that after I unplug the phone from the charger, the screen is frozen for about 4 or 5 seconds. I cannot do anything with the phone until this 'timer' runs. For instance, it can be plugged in and if the phone rings, I see the call come up but if I unplug the phone I cannot activate the slider to answer the call until after a few seconds. Likewise, I cannot bring up the home screen after unplugging until the 5 second freeze ends. The phone did not do this initially, but just began acting this way in the last few days. Perhaps I installed an app that is causing this behavior? Sometimes it freezes longer than 5 seconds and I then get a dialog box stating "Process system isn't responding. Do you want to close it?" with a 'Wait' or 'Close' option choice. Is anyone able to provide any insight into this issue? It's quite a bit annoying. Not a show-stopper obviously, but not the way that I'd like it to work either. Thanks very much for your time. I appreciate it.