In the last few days I had some situations where big machines spawned right in front of me.
Yesterday I destroyed a harvester at the airfield and in the same moment the reaper spawned just in front of me. 
Same with some harvesters spawning right in front of me at other places.
That didn’t happen ever before.
Anyone else?
Yep. Happened to me last week. Downed a tank and went in to loot. Heard a noise behind me, turned and voila…a harvester RIGHT there. Needed new underwear.
No, never happened to me.
Edit: I have to say that I have a Reaper roaming the lands and I let him in peace. The chance for spawning a second Reaper right in front of me is slim. I do check up on him from time to time.
Actually just happened again about 5 min ago. I was ready this time. 