I've been using it for several days since my OP, and no issues since.
However, I also haven't re-created the circumstance when I experienced it. Was testing it on a guildie (to confirm how Mummy Wraps works when cast on others). My guildie left my group and when grinding some distance from me. He died, released across chunk lines. He resumed killing. BTW, I was probalby being healed by him from ridiculous distance (chunk or more away). At some point, I crashed, he went with me at almost the exact same time.
So, assuming that non-groupies in other chunks who have your mindspy on them and are killing stuff *might* be causing the issue I was referring to in the OP. Definitely interesting how Mummy Wraps works, though. Wondering if I can't apply Mummy Wraps to the whole raid by moving from group to group... maybe cause the whole raid to crash