Hmm, that really a little bit strange - i mean this memory leak problem.
A lot of users have this problem, and complain here in the forum (hehe yeah, me too *g*) - but on other xboxes the memory keeps in a stable form, so they can play hours and hours.
How can this be ? The Xbox is not a PC, with different Operating Systems, Settings and/or Hardware components. Whats the difference between a xbox without this issue and the one without ? Either the bios, or the dashboard from where you load surreal, or the settings in surreal can be different, am i right ?
Maybe im wrong, but i think the 64MB ram in all xboxes are the same - so this can't be the problem.
Yesterday i testet surreal with all kind of different settings, and my memory did always get lost - sometimes faster, sometimes slower but always sure

Ain't nothing geting lost here. I don't keep track of it using the debug settings but I've played Mario Kart for hours and hours and even more hours (and some minutes and seconds)!