OK, so I reflashed the drive with the 9L08 firmware and burnt a couple more discs. I normally burn with Smartburn, OHT and FHT enabled but I thought I’d try with them off.
The first disc was burnt with OHT and FHT disabled but Smartburn enabled and might have been passable until everything went south (well north actually!) towards the end.
The second disc was burnt with Smartburn disabled as well but showed similar problems towards the end.
I’ve also noticed that often with the TRT tests (which were fine for all the discs by the way), the drive will fail to spin up to full speed and so will start the test at about 3x, so I have to cancel it and restart it, which works fine because it’s spinning at full speed by then.
Also, on occasion the drive won’t recognise a disc and I have to eject and close the drive again to get it to register.
It seems clear I’m going to have to buy a new drive and I don’t think it’s going to be another Liteon, seeing as this is the third one I’ve had and all of them have failed around the 1 year mark, despite only being used for burning and scanning and only burning about 200 discs (if that)