I think this book is of fairly recent vintage (2009+).
It involves a dystopian real world burdened by overpopulation. Science has developed a Matrix-like digital world where human consciousnesses are uploaded to an idyllic environment, at least for the people with enough cash.
Almost everyone who can afford it is in this new silicon environment. Then someone starts turning off portions of the new digital world. The protagonist is the lucky one to get re-sleeved (to use Morgan's apt phrase) and goes unwillingly back into meat-space to find the perpetrators.