It's not the systems being tested, because I haven't heard it.
It's mostly something that you changed. Since you don't run Pri, it isn't that, but it is "something".
I always keep an old version (several, actually) of my .p95 file, and go back to the last one when a reprogram "goes wrong". Several times (with this scanner and my -92, it's taken two or three tries to get something in there correctly (especially with new trunked systems - early on, the data is often incomplete).
Jay