Strange slew failure with SGP / TSX

thanks Ken - I posted on SB forum with their logs and they asked a few questions about what camera I was using - maybe a timing clash.
It hasn't happened since. I also made up a mosaic and did short single exposures of each panel to exercise the sync. It behaved itself after I deliberately set the sync method to offset. (There is another thread where I had recurring issues with the sync setting persisting. If I stored it in a profile, it read back as if it was set to offset but behaved as if it was sync mount.