While we're waiting to find out what's going on, here are a couple of things to think about:
1) Do you have sufficient swap space defined? If you run out, your OS can hang or panic, depending on what process requests memory.
2) If you're running X, and missing the panic->drop to ddb, you can disable the drop to ddb by setting sysctl ddb.panic=0. Instead of dropping to ddb, the OS will dump RAM to swap and reboot -- of course, you need swap space for this to happen. See crash(8) and ddb(4) for more info.
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