In several places on Nott Amp station, including near one of the shield generators, you will hit "Restricted area, leave immediately" I assume this is when you are on top of one of the new underground Spawn tunnels, its annoying, I take damage because of it, if I am in low health its killed me. Its not just a small area, its spots all around that amp station.
Perhaps this is a good place to mention that the "Restricted area, leave immediately" has been getting stuck on my screen a couple of times. I was able to clear it by switing to the map, but still an anoying bug.
I experienced the same thing at one of the Esamir amp stations. There's at least one other thread about it here with attached videos.