[cisco-voip] Parity errors at E3 controller on 7304 router

[Anthony Kouloglou]

Hi all,
i have a voip network and a gateway in the cluster is a cisco 7304 
carrying a E3 controller (PA-A3-E3). Each day, the controller gets shut 
suddenly and it does not work untill i give "no shut". I can see in the 
"show controllers" that there are a lot of Parity errors.
The E3 line was working fine at the old 7500 series with exactly the 
same E3 controller.
What could be possible wrong?

Thanks