Thanks Brian,
I'd seen the LL thread,but not the lifewitha7900.blogspot thread.
Unfortunately, the problem now occurs all of the time, with either an Ethernet or a USB connection.
Since it always happens right at the very end of a print, I suspect that something is being reported by the hardware that the Epson firmware doesn't handle, causing it to attempt to reset itself.
Since sheet media loads correctly, I'm currently wondering if the Ink Mark Sensor is bad.
Does anyone know of a source for this sensor, or perhaps have a broken 7900 or 9900 that could be a source of parts?
Thanks!