Manifold/header/muffler/tail Pipe problems of the 2010 Lincoln MKT

Over the last 2 weeks, my Lincoln Mkt has experienced several episodes of shuddering and loss of power. In addition, a significant amount of smoke has been spewing out of the tail pipes occasionally - this usually happens for several seconds after the vehicle is started. I first noticed the shuddering while driving along the highway. The next day, there was a significant loss of power while driving. The dealer diagnosed it and said it is a turbo underboost problem that can be remedied by replacing the turbos. Due to the significant cost of replacement, they suggest that I consider replacing the vehicle, as some of their customers do. This tells me we have a known issue! a turbo problem on a vehicle with under 100,000 miles? sounds like a major defect that the manufacturer should be aware of.