I've been having problems with my xbox live profile for the last several months. Basically what will happen is that the profile with completely reset, losing it's avatar, gamerscore, everything but the name.
In order to fix this problem I generally recover the gamertag from xbox live, but now that is only helping for very brief periods of time. Once in a while I will recover an already corrupt profile, and usually it only serves to fix the problem until the next time I sign in.
The problem started happening about 2-3 months after I started using a USB stick to store my profile, I do this because I have the new model xbox, which doesn't have memory card support (Bad idea Xbox...) and it is the easiest way to transport my profile and game saves to the 6 different Xboxes I could use at any point in time. 1 at home, 1 at my parents', and 4 at a cybercafe/gaming lounge. This problem ONLY affects my profile, no other profiles on the stick are ever affected. And all the game data loads and works as it should.
I have reformatted the USB stick already, and that only resolved the issue for a couple of days, I am not about to repeat the process of moving all the data off the stick, reformatting it, then moving it all back every time I have this issue. But since the account-creation server is apparently down for xbox live, I can't recover my gamertag right now. Any tips/remedies?