Boy, if it's not one thing, it's another. Sometime on 2011-09-26, we started getting noise on the 06 repeater. Sometimes, the noise is near the tail end of a user's transmission, sometimes it appears on its own. Occasionally, the UHF repeater voice ID can clearly be heard, other times not.
Whether this is the old "Crunch Monster" that used to appear on the system years ago and not heard in a good two years, is unknown.
The good thing is that, whatever it is, stations can transmit over it and be heard.
Your SCARS Technical Committee is aware of the issue and is in evaluation mode.