[c-nsp] ME3600 FCS packet generation issue

[Jordi Magrané Roig]

Hello,
My name is Jordi. I have a strange issue with one of my 
ME3600. I have a ME3600 connected to a C7609 via the G0/24 port and 
connected to another ME3600 connected via G0/22 port. In the middle of 
the connection between the two ME3600 there is a SDH network (Ethernet 
over SDH). I have a recurring issue in the ME3600, for some reason when 
the device receive a packet and forwards the packet, the device sends 
the packet with FCS errors, so the other end detects the "input error" 
and drops the packet. I don't know if the device sends the data 
corrupted or makes wrong the calculation of the FCS. The device can work
 correctly during two months and some day the device starts with this 
problem. Reloading the device fixes the issue during a time. I saw the 
issue for the first time at June. I changed the device, but the issue 
appeared again and I upgraded the IOS from 15.3(3)S to 15.4(2)S1 but 
still the same. I think that this issue could be a bug but I don't know 
which event triggers the issue. Someone could help me?
Thank you very much and sorry for my English.