playa1 datasystem data system hung on about 23z, Jan 13. When John/Steve connected to the console port the next morning it was reporting a lack of memory:
...
My wild guess is that in rare circumstances, the kernel exhibits a bug where it doesn't free up the buffer/cache memory for use by processes. Time to upgrade the kernels from 2.6.16...
Or it could be due to a sensor input going bananas. I'll look into that.