Last night my phone abruptly began to lag and now I am no longer able to access basic features like Messaging, Settings and Internet Explorer. Screen just turns black for about 10 secs when I select either one and goes back to the previous app used. Reaction to soft keys, and lock/unlock button is also very slow now. I've soft-reset the phone about 10 times now since that seems to be the only way to get into my SMS menu, and after the one time it won't allow me to get back in again. Very aggravating, any input & help is appreciated.