problems with gears of war 2

So I don’t get it just got the game yesterday was playin no problems for 2 hours prolly n it started saying connection to host lost everytime then the game would freeze I got a good amount of matches in before this issue I put in cod 5 played without ne problems I’m gettin frustrated I’ve been doin some reading and I guess some of the gears disks are messed up or something in that nature was gonna try n swap it out n see what happens anyone else have any sugestions?