BayNetworks BGP weirdness last night

Anybody else with a Bay Networks router using BGP see weirdness last night? Our router started shutting down BGP links saying "AS Loop Detected", but turning on BGP debugging didn't find anything that looked like a loop to me. Eventually I had to turn off loop detection. I was wondering if our router was being weird on its own, or if a route made it into the global routing tables yesterday that Bay's software misconstrued... Thanks, ------Scott.