I found going dead downwind wind and 3-5ft waves, the spin popped out of the bag into the bow and went shrimping.
Beach debrief said, use a little heat so spin goes to side of boat.
I went shrimping on take down to, so I will head up slightly, so spin goes over side of bow.
I think wave action caused this, as I have never had a problem on flat water going dead downwind.