Samsung SCH-i760

well i'm not sure what happend with my i-760, but all of a sudden a weird black shade/spot thing has popped up, on the screen. does anyone know how to get rid of this, or what i should do? Also when using the wi-fi it atomatically turns off, when im in the middle of downloading an apllication, and when visiting some websites, im not able to click on picture links nor some text links, that are colored blue (when i know for a fact that it is a link).

Can anyone help me out and suggest what i should do with my phone to repair the glitches, should i take it to the verizon tech place?.........

tnx!