I'm having the same issue with a non XT, but haven't gotten a response still, so I haven't tried any fixes.
Instead of the RAM issue, mine is with my LL120 fans. I think one of them has one bad LED so all six of mine are glitching all the time. If I select all but that one LED they'll generally be ok. That said, it often goes out of sync, the fans won't even be lit, they'll flash like crazy, or they'll be all kinds of weird colors.