Yesterday we had a T4 standard Mission on Consignment Yard HL-17-36 and in the first segment of the map, on the “outside” Area, the Hordes dropped for Minutes continously like a Waterfall. I logged out because it made no sense, ofc i don´t know how long it would have been like this. I played this Mission very often on T4 and that was clearly a bug. or a feature for murdering the mousebuttons 
There was a also small Diamantine in this Section that can´t be picked up.