I had a reaper appear then a control point at Sjoglimten. I went to destroy the control point and had to run around like a mad thing to avoid the Reaper. I finally managed to destroy the control point and started to run away to avoid the reaper only to see the message Reaper destroyed by player. I went back and there it was destroyed with all the shield emitters still working. Works for me.
Machines explode if they fall into water.
If it’s deep enough to make a player respawn, machines don’t survive, too.
The same thing like here: