ControlNet Noise

Good afternoon,
I have a problem. There is a Control Logix 5000 controlnet adapter linked with point i/O and PowerFelx. There are 20 nodes in the controlnet.
When the relay (used to brake the motor) of the Powerflex is turned on, there is a little noise in the controlnet and in some case it put down the entire net. (see the photo)
Can anyone help me to solve this problem?

Thank you.

Are you following the cable separation recommendations?
Has it always done this or has it only started happening after a long period of troublefree operation?

Check out Rockwell Technote 16990 (Pay-walled) ControlNet troubleshooting.

And make sure you haven't made any mistakes as per ControlNet Coax Media Planning
and Installation Guide
http://literature.rockwellautomation.com/idc/groups/literature/documents/in/cnet-in002_-en-p.pdf

the photo is here:
http://it.tinypic.com/r/29to5f/9

it's 4 weeks that the contronel goes down. 5 times a day.
it always worked well Before.