the 2006 issues were usually to do with low-lead solder used on the graphics chps going brittle and failing. Most noticeable on machine with nVidia graphcs, but others were caught as well. Also around then there was a plague of machines with faulty Chinese "wet" capacitors which blew prematurely (allegedly due to a faulty bootlegged recipie).. Neither problem is relevant now.
In this case, two machines from the same production run suggests they both have the same generic hardware fault. The shop isn't going to be able to fix that, except through refund or exchange for a different model.. They have the legal responsibility, but not the tech skills. If you want a machine that is actually going to work as advertised, speak to Tosh. Their tech team ARE good, they can usually turn a machine round within a week (including transit to/from Germany) and I've known them replace failed new machines with new replacements. Call them and see what they say: doing so does not restrict your legal rights WRT the supplier under the sale of goods act. You could still ask for a refund