I don't have any clonk or noise problems with my 755A. But my PX-130 sometimes makes that closing sledge clonk sound, when it closes. Just one big clonk. But its not very often it happends. In fact it has only happend a few times (with a CD or DVD in the drive closing!).
Could these problems be releated, bad manufacturing quality or? As my PX-130 normally works perfectly, and is very cheap, I don't think I'm gonna report it faulty by Plextor. Just wanted to share my problems