Please help.

There seems to be quite a major bug that means Hancock dies when dismissed to a settlement. I left him at Red Rocket with the majority of the other companions, and for a while it was fine. Then one time I return there and find him lying dead on the side of the road. Has anyone else had this problem and is it only Hancock that's at risk of dying or are other companions at risk?

Restarting from my last save where he is alive would mean losing too much progress so I'm guessing the only way to fix it is for Bethesda to fix the bug.