Strange hack bug

[g...@svax.uucp]

I have occasionally found a very strange problem when running hack.
I am running version 1.0.3. We had been running quite stably for
a while the following mods:

fountains, spiders, new traps (magic and squeaky board)
magic markers (cooked up here)

I recently installed changes with Samurai, Ninja, the various weapons,
that go with them, level teleport traps, spiked pits, and all the
various fixes that go with them.

The bug is the following: I'll be cruising along, nothing strange
happening, and suddenly there will be a slight pause (as if I were
about the fall through a trap door), and then I get the shell prompt!
No death by panic or trickery or anything like that! Just gone -
everything.

Has anyone experienced this? Any ideas of where to look?

- Gil