asterisk users - Jul 2004 - random red alarms with t100p

I'm getting random Red Alarms with my T100P.  I am using cvs zaptel from
July 13, & have tried using remove clock source & local clock source. 
There doesn't seem to be any warning: every couple of days the line goes
down, & then around 5 seconds later, it comes back up. 
If anyone as seen this behavior, or has any ideas about where to look,
please let me know. 

Thanks, 
Glen