External Burner goes weird after each burn

vbimport

#1

External HP DVD 840e

When using ConvertXtoDVD I’m getting a drive not recognised message or similar . The burn is successful but I then have to re-power up the drive.

Have updated with the latest firmware via HP, drive is about 6 months old and aside from this there are no issues.

Burning with Nero is fine.

Any thoughts?