I am having trouble with a Mark Vie PDIA (discrete input) module that I can't figure out. Every so often the module will lose communications with the control system, and I will get alarms in that are on that module. Sometimes it will clear on its own, and a diagnostic alarm 285 will pop up. Other times the alarms won't clear and the communications will continue to be lost, and I go out to the module and have to pull the power on it to reset it. At the module there is no indication of a problem. Both ethernet lights are transmitting and receiving and no diagnostic alarms. I've tried replacing all sorts of parts, but can't get anywhere. If anybody has any ideas it would be appreciated.