Game Freeze on XBox

We are XBox newbies having just made the move from our outdated Game Cube system. We have been playing Battlefield: Midway and Rainbow Six Vegas and have had a periodic problem with game freeze. The image just stops and there seems to be nothing to do about it except turn off and restart the XBox. At first it only happened with Midway online. In the middle of the game it would just freeze and we figured it was happening to everyone on that game. The other night it happened while we were going through the process of joining an Rainbow Six Vegas match-everytime we got to this particular load it would freeze. Again we thought it was an online thing. Then last night for the first time it happened while playing Rainbow Six on our XBox (not playing online but at the time we were signed in).We never ran into game freeze with Game Cube.

So my question is "Do we have a problem with our consule or is this a normal occurance?" Is there anything we can do to avoid it and if it happens is the only thing you can do is restart the consule?

Thanks.

P.S. We did get the no questions ask replacement warrenty at Best Buy.

oddily as it seams lately ps3 users are faced with the same problems,

only problem i had with my ps3 is a few times where it wouldnt eject the disc,

but it works now,

also vegas freazes up ,,

on 360 ive had disc drive problems xbox live problems disc scratch/melt or crack problems as well as the famus red rings of death,

xbox live is also a chore for me lol, it freezes from time to time, if i was playing gta iv , id randomly lose serve connections