Some help please!

I take pics for a wrestling company and use a canon rebel xt, have had it only a few months so am still learning. I keep it on auto or portrait for quicker shots. About halfway through my 2gb compact flash card everything slows down and it says busy on the camera, the lag time goes from being a second to more like 10. Have tryed a faster card but same thing happens. Then around the 350 mark i get crappy pics, blurrier and blurrier the more shots i take. Granted the camera is on for about an hour, switched off for the interval and then on again for another hour. I just dont get whats going wrong? This never happened in the beginning.
Was thinking of upgrading to a different camera, really all i need is a very bright flash and shot to shot speed so i can catch the wrestlers mid air, all the rest of the stuff on the rebel i dont need!
Any help with camera i already have and recommending a different one would be awesome!

Link to a few pics taken at saturdays show if yer interested, you can see how the pics degrade.

http://z11.invisionfree.com/4FWrestl...?showtopic=673

That is strange.

Perhaps your camera's battery is getting weak and hence the flash has less power, so it is automatically using a slow shutter? But that's a reach.

Are you autofocusing? That last shot looks more out of focus than blurred, but I'm not sure either.

Are you shooting in bursts? Continuously? It will buffer the data and write it to the card as fast as possible but will slow down as the buffers get full, until it can "catch up."

Those are some possibilities.

Unless it does it all the time I doubt it's your camera breaking. Might just be a limitation as described above.

Note that, theoretically at least, larger memories will be slower.

GB

I would get an external flash, and a battery pack for it.
That will give you brighter flash, and longer battery life on the camera.

I would say that the flash is draining you battery causing the flash to die. I'm surprised that your camera just hasn't turned off. You should just get a spare battery or two depending on the amount of time you need to shoot.