I changed my gamertag on the 7th. For the first 12 hours (just a random guestimate) I could join my friends, we'd all be in parties, but my friends all saw my old gamertag in their friends list. I got off after playing MW3 for a good 4 or 5 hours, took a break for the evening, and then got back on last night. My friends could now see my new gamertag in their friends list, but I couldn't join their games or parties, nor do I get pop ups when I get message or game invites. It's only after I turn my xbox off and then back on, do I see those messages. I called support last night and they said it's happened before, but they don't know the real issue behind. They had me shut down my system and internet for 5 minutes+ and when i got back on it worked for the rest of the night (I lost connection on the phone when I turned everything off, because I forgot that the place I live it right now use internet connection for the phone system). Anyways, I got back on today and it's doing it again. I don't know what's going on. MW3 just came out and I'm having problems due to xbox issues. Please help.