My Nokia 770 has been freezing up a lot lately. It doesn't freeze up all the time, only at certain times, so I can't show someone whenever I want. It's just a random thing. What can I do to remedy this problem? I got it 11 months ago, should I contact Nokia & see what they say? Maybe they can fix it for me or replace it? My sister-in-law just got a replacement and they sent her an N800. Should I try for that? What number should I call?