i use dvdshrink. but since they are no longer releasing updates for it and sony came out with new encryption that shrink will not crack I also run a program called "Anydvd" all you do is open it up and run dvdshrink and it...
I had the same problem with my plextor 708A
was using the same media 8x+R and would burn a movie in about 5-10 minutes
all of a sudden it was taking 45min or an hour with the same media.
try this it worked for me
i would bet that the buzzing is probably going to be your bass boaster. sounds like its on its way to the crapper. next time it starts making the whoomwhoom sound turn the switch off in the front and see if it stops