OK it just happened again and I have the log file here:
BTW, the drive is nearly new and there are no updates.
I 16:00:50 ImgBurn Version 2.3.2.0 started!
I 16:00:50 Microsoft Windows XP Home Edition (5.1, Build 2600 : Service Pack 1)
I 16:00:50 Total Physical Memory: 785,772 KB - Available: 592,120 KB
W 16:00:50 Drive D:\ (FAT32) does not support single files > 4 GB in size.
I 16:00:50 Initialising SPTI...
I 16:00:50 Searching for SCSI / ATAPI devices...
I 16:00:59 Found 1 DVD