TBC Baseline Processing Report
Does your 5700 have updated firmware installed for a leap second that arose a year or two ago?
Yes, got that firmware update, but even without it editing the RINEX file wasn't too complex. We dug the 5700 out of storage for GPS on Benchmarks.
I always enter a "global" coordinate referenced to ITRF2014 current epoch in to my processing, I wonder if that is a factor in this?
One note from years past. GNSS positioning software will automatically overwrite existing files, thus it needs to have administrative status. Check and see if some automatic system update altered the permissions status of your GNSS software.
Paul in PA