FieldPoint suddendly looses connection, but only for some seconds

Hi,
I have a problem with LabVIEW and/or FieldPoint modules. I use the ethernet controller FP-1600, the analog input module FP-AI-110 and the digital output module FP-DO-400.
The controller is connected with the PC via crossover cable.
I have written a VI, which should control an engine with the digital output module and measure some parameters with the analog input module.
For the engine control I use the following cycle:
20 sec load (digital out: channel 0 = true; channel 1 = true)
5 sec no-load (digital out: channel 0 = true; channel 1 = false)
2 sec power-off (digital out: channel 0 = false; channel 1 = false)
The VI set automatically the output channels.
With the analog input module I measure continuously (every second) temperature, motor current und the speed.
For the most part the VI works without any problems.
But sometimes the PC looses the connection with the FieldPoint modules. This failure occurs only in the change from “load” to “no-load”. In the other changes I didn’t see this failure yet. During this failure the motor parameters shown on the frontpanel don’t refresh. After 3 – 5 seconds the failure is gone and the VI works fine again.
What could cause such a problem? And what could I do to solve it? Thanks.

I think you had the right idea.
The digital outputs are connected to relays. The first relay switches an electric motor (on/off). The second relay switches a magnetic brake (on/off). This brake is technically comparable with an eddy current brake.
I suppose the high inductivity in the switching moment could cause the described failure.
Now I will try to use a recovery diode to minimize the high inductivity.
Do you think that could be the cause of error?

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