PMA update failure?

Tried burning a bin/cue but at the finish Nero reported:
“PMA update failure”
Any one have any idea what this could be? The burner 24.10.2B appeared to be hunting at the end of the burn -lead out, the motor speed rising and falling - it also did this at the beginning of the burn! Also has “hunted” in the middle of burns.
The media is Datasafe x52 This is the first time I have had a failure with these disks

I have since tried some Samsung Branded disks and been successful. Have binned the 15 remaining Datawrites. So it is once again down to crap media!! - I assume?