Is this supposed to happen?

I just bought some TYG02s and I thought I was in for a pleasant experience but my 1620 is still doing this thing. It just stops burning for a couple minutes, then starts up at a really low speed and poor quality. The spot that it does it isnt exactly the same for every disc but they all look like this
<p> <img src=“http://www.trapdoors.net/images/burns/002t.png”><p>
<img src=“http://www.trapdoors.net/images/burns/e002c.png”>

i checked my dma settings and its mode 2 like its supposed to be
maybe i dont have a big enough power supply?