URI.Bit.Register bit not staying high

I am using Ethernet/IP protocol for communication. I am trying to identify the URI.Bit.Registers in the UR robot. I have the bits programmed in a 1769-L18ER-BB1B PLC. When I trend the bit, I see it dropping in and out. The RPI for the Ethernet-Module is set ay 2.0 ms. My IT dept. says the switch port is fine. Is there anything I’m missing to establish a solid communication path? Thanks