No, mine has been 100% stable, nor do believe my Surface Book is unique or special in any manner; the early ones had issues with software that MicroSoft fixed. As to whether the hard hardware tweaked is unknown. Same with Apple when they release a new MBP their is frequently issue the first 6-12 months.
Q-6
When I had an issue with my surface pro 3 microsoft just sent me a new one and I returned mine to them
I was surprised how good they were tbh