This obviously isn't the 'Ask LeosLeader' thread.

Your BB is probably toast. The stock GXP BB that comes with Omniums & S300s is sometimes problematic. I say "sometimes" because I know people who have used it without much fuss at all and others (myself included) who have blown up five or six of them in a row. The first sign is that audible 'pop', followed by increasing side to side play - regardless of how tight the NDS bolt is.

If you plan on keeping the Omniums for the long run, invest in a Chris King or Phil Wood outboard bearing BB. You'll thank me.