I was having a problem with my xbox 360 as it was freezing all the time and saying the disc was unreadable even though the discs I have are in near perfect condition. I, like any reasonable person said that it had to be a problem with the xbox so I sent it back. They sent me a brand new system and deemed mine as being unfixable. Naturally when I got the new system back I figured that it would work no problem. I played it for a while and began having the exact same problem again, the system just basically refuses to read the disc. The games I have are, with the problems listed in parenthesis:

NBA 2K9 (cannot show replays and feeezes for like 2 mins and then the game loads up again and plays through but will not play replays.)

Gears of War 2 (game plays for like 10 mins and then says the disc is unreadable)

GTA IV (some problem as Gears 2)

Street Fighter IV (no problems as of yet)

I cannot imagine what the problem would be, I am playing on an older tv and am using an RF switch so it isnt using the cables that come with the system

Also I am using a wireless controller with a plug and play cord as the charger broke.

What am I supossed to do here? I am very frustrated and considering getting a PS3. Please help me out. Hope that was enough info.