The nexus is bugged its not the person doing the nexus its the people recieving when starting a new squad.

Trigger: Creating a new squad or joining a new squad(I assume it coincides with the squad bug where it doesnt show your teamates on map or on overview, and sometimes the yellow dot freezes. So it may have something to do with the internal squad mechanics that may not actually be effecting nexus directly but a side affect.

Bug Signs: three different types of things happen sometimes
1.It flips on and off 2.It switches back and forth if running 2 nexus or more 3.Doesnt show up at all.

Temporary Fix: The whole squad log in and out again fully to recieve full affects should fix it. If it doesnt you can go back to station and log out itll definitely fix it. Aslong as you stay in the same squad with the nexus guy itll work with no bugs.