Have you ever gathered a node and for whatever reason, did not actually pickup what you harvested and left it on the node so that it becomes a lootable item? This has happened to me a few times and then I thought, if someone else did this, would it lock me out of that node until it was looted by the original person? Just thinking outloud, but I've noticed alot of unresponsive nodes in Taris and Nar Shadda (Republic Side) also.
I'll do my part by reporting more often.