simocode bus fault

Hi,
Can you tell what are reason for simocode bus fault.

Here i have used node 11 to node 78 with two repeater and profibus CP443-5 EXT module.The past three month simcode working properly. Now i facing frequent bus fault in above mentoined the node.
I have changed profibus connector,profibus cable,simocode,CT andprofibus cable seperate from power cable,but still i got bus fault in simocode the basis some time intervals.


Kindly give us solution for rectify the bus fault in simocode.

Thanks in advance.

Splitted from SIMOCODE BUS MONITORING.