BB Curve :: Faulty Keypad/buttons, Phone Freezes?

wandered if someone could diagnose what's up with my BB, curve 8520 and maybe also gimmie a solution to my problems! ... Here's pretty much all of it ... I think, I know a lot of you can relate because this seems to be a very popular problem...Bout a week ago my bb randomly started messin me about, first the 'L' key along with the 'alt' key and then also the 'A' key, they were stuttering, typing on there own, sometimes wouldn't work at all, they would even pop up when I typed a different key! also there would be times were my phone would freeze and I'd have to hold down a button for roughly 10 seconds to get a response, also all buttons including mute, side buttons, keypad etc.. would stop working all together, only track bar would work but I could only scroll, I also cannot use my phone whilst chargers in, on rare occasions my phone fixes itself, then brakes around 5-10 mins later