DVD Burning, buffer goes to 0 when burning two dvd's at the same time

Can anyone tell me what would lower the buffer to zero when burning two dvd’s at once? I have a Benq 1620 and a Pioneer dvr 108. They were fine up until a few days ago. I use dvd decrypter the most. Anyways, they had no problems burning discs at the same time, bit the buffer and the device buffer were at 100% and the dvd would finish in about 15 minutes. Now the device buffer is fluctuating and the buffer is at 0, nnow the dvd’s don’t finish for about 24 minutes! Anyone know what this could be? thanks

Hard drive throughput problem? Check for DMA in all devices. Check for speed of hard drive using HDTUNE. Use the same burn speed. Use Windows system restore to revert to a previous windows configuration.

Defragging the harddrives might also help!