I shall explain what happened with more detail (but NOT enough to find where we are), so as to help others to keep their eyes open for this phenomena. There are 2 reasons I will not say where we are; the first is because I am not the 'team leader', I was invited in by somebody else; and second, because if I post the location up here it will almost guarantee the system will be flooded with Player Killers (when I was trying to land near a Barnacle I was, without warning, attacked and destroyed by 2 other players. When I was recently in the MAIA system there were several players in major vessels taking out other vessels that turned up. I left in Solo mode. One player in a Federal Corvette was doing his best to warn others of what was going on.).
The system is within one thousand jumps of Sol. There are 2 (or more) stellar objects (stars, in other words), and 10 (or, again, more) astronomical objects (planets and moons, in other words), but there are NO asteroids. This is all I intend to post descriptive wise.
When I arrived in the system I was on my own, but a friend (who had been told about the system) was going to meet me there. I ran the initial scan, and when I got the results (I did NOT know about the anomaly at this time) I let my friend know. He made haste, and got there within a decent timescale. We winged up, and then started to explore. I then found there was another Commander in the area (and he was surprised to see us), and I invited him into the Wing (he joined). As we continued checking out the system (I was going to a mini solar system, with a stellar object and other objects) I noticed that I could no longer see the other 2 Commanders on my sensors, but I did not think anything of it at this time. I got detailed scans of the objects I was interested in, and then (thinking we had an Instancing issue) I dropped out of Super Cruise, and then went back into SC, but no change. OK; instancing fault was still happening, but we could still communicate, and see each others' ship status indicators. I then headed off to another mini solar system, when I noticed that I could now see the others on sensors. This got my attention, and I pointed it out to the others. I turned around and went back to the previous mini solar system, and (but I don't know at what range) I lost sensor contact with the others again. That really piqued our interest (to the point where my friend contacted his friend who had told him about the system, and this person headed over), and we have now started checking out this mini system. At least 1 planet can be landed on, and we all have Horizons and SRVs.
Next time I am in-game I intend (with the permission of the others) to fire up a Private Group, so we can explore in peace while still working together. I will (with permission of the team leader) post the results here. All 4 of us are now in-game 'friends' so that we can continue working together on this.
Unless this is a fault, it might suggest that looking for anomalies would be a team effort (to help triangulate things such as this potential 'blanketing field').
Fly safe, and see you out amongst the stars.