From a knowledgeable insider comes the following: "The 3400 memory problem has very little to do with the thin design. It has everything to do with the PCMCIA card cage. We seen this problem on the 190's and the 5300's also. Apple doesn't always get the card cage flush on the motherboard when they mount them. It sticks up just a hair and puts pressure on the memory. The memory acts like a lever at that point and the first shock it gets, pops it out of the socket."