asterisk users - Sep 2004 - IAXy loud static problem

I just bought an IAXy and have been using it with * and NuFone. Around 
once every 24-48 hours of operation (not off hook, just powered up), 
when I pick up the phone I hear loud static instead of dialtone. If 
there's an incoming call, the phone will ring and * CLI will show that 
it's trying iaxy, but when picking up--no answer to * and loud static. 
The incoming call goes to VM. Cycling power on the IAXy fixes the 
problem. Has anyone else had this issue? I'm using a fairly new device 
(2 wks. old) with Digium's power supply, and Asterisk 1.0RC2 on FC2.

Thanks,
Brad