DeviceNet Bus Warning!

Hi,
I have a two IRC5 140 robots connected in deviceNet and they sharing information! I have too 6 cards IO in DeviceNet and a touch screen Omron NSJ8 to communicate with one of the robots in DeviceNet! Every components are connected to the bus DeviceNet and I make the correct connections like, just one power supply, the terminal resistors the lengh of the cables etc etc. This work fine, but when I connect my computer to the service port sometimes I have a warning in communications EVENT MESSAGE 71300. That say: A minor number of communications erros ocurred on DeviceNet Bus and sometimes the robots stoped movement, just when I connect my PC whith robotStudio Online...
Anyone can help-me??? I verify all of cables, all of connections all of configurations of the cards etc etc. I don't Know what I'm doing wrong .
Best regards,
Joao Fidalgo
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