Title says most, Cannot get it to happen outside of a Greater rift, Doesn't matter if Solo or in groups.
I took a little video to show it happening (Sadly in a record run) And it seems from watching it, I got them to start shooting again after pressing my potion, Seems dumb but considering how the snapshotting with stricken was, i wouldn't be surprised.
After using The carnevil for a while now, I haven 't found the Cause of the bug, but for anyone getting this. When you notice they aren't Shooting take damage and heal with your Heal potion. 100% of the time during runs this has worked to fix the issue, Hopefully blizz will fix soon, They already seem to know about the Bug.