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First, be sure that the IP that is displayed in Medivis Viewer in the HoloLens matches that which you entered in the SurgicalAR software. Also be sure that the wifi connection in the HoloLens and the wifi connection on the computer are both connected to the same network
Check stability of wifi/router connection. Make sure you are connected directly to the SurgicalAR router and no other devices are connected besides the computer and HoloLens. Also check if there are multiple other wifi networks in the area that will conflict with the signal.
Do a hard reset of the HoloLens by holding down the power button for 10 seconds. Often what happens is there are too many instances of the Viewer open in the HoloLens and they clog up the CPU.