Yeah, happening last night - trying to get into the Armor Master crafting station in Memorial - ended up getting 2k tel var before we finally got in there.
This may or may not be related to your issue, but if there are a lot of people in the same district or loop in the sewers, and they are all killing mobs, they will respawn almost instantly. I am not sure exactly how it is coded, but the game seems to have a quota of mobs that need to be up at any given time, so killing all of them will bring back the dead ones faster.
Usually a mob you kill and then wait for takes ~10 minutes to respawn, but if you run a loop with some friends you can do it in less than 5, but they will all be back.