My Droid Razr Maxx is about 2 years old and lately has become almost unusable. It's extremely sluggish and frequently locks up for what seems forever. It's gotten to the point that it won't respond to me answering calls before it goes to voice mail. I've tried the hard reset by holding the On button and - button at the same time but it doesn't help. Is there a way to tell what's causing this? I don't recall any particular app addition when it started. The thing was awesome when it was new.