I had a Fujitsu Allegra 192 (Vodavi DVXplus IV equivalent, the predecessor to the XTS) that did the same exact thing. All of Vodavi's digital systems ultimately followed a nearly identical program set. Our problem was so bad that Vodavi flew out a support technician to troubleshoot. We replaced every single component, all the way down to the cable connecting the cabinets together to no avail. In the end, we were only able to capture a full download by halting all system call processing activity. We did this by pulling all of the cards and lowering the baud rate to 1,200. It took forever, but once we got it, we ended up replacing the MPB and upgrading the software to FP3.

We never got a definitive answer as to why the problem was occurring, just a solution. My guess is that the processor couldn't handle everything happening at once. We may never know.

Ed Vaughn, MBSWWYPBX