If I have been running for a while since my last reboot, when I try running Qtopia games designed for the old Zaurus 5500, my C1000 will go to the black screen like it's switching resolutions for a few seconds and then show the reboot screen. However, it's actually locked up, and I have to open the battery cover and reset the C1000 to get it respond again. If I try running the same game immediately after a fresh reboot, it runs fine.
I typically run the PIM apps, Kino2, some 640x480 games, and the SNES and NES emulators so it's possible that one or more of them has been run between the reboot and the crash. I haven't narrowed down the conditions more specifically yet.
Examples of games that do it are: Froot, zBlack-Box
Is anyone else having this problem? It's the only real problem I've encountered while running the latest Cacko ROM. (Other than wrong-sized window decoration icons when in 320x240 mode.)