SOLVED. Adult Sci-fi : Spaceship wakes crew, they find a wall being built around a planet

[Richard]

Came across a book 3 or 4 years ago, and read the first couple of pages. Here's what I remember

-Crew of a spaceship in cryogenic sleep, or stasis, something similar
-Spaceship is sentient or has AI, and is running things while crew sleeps
-Ship detects something in space and wakes crew
-Crew finds that a wall is being built in space; I think it's being built around a planet

[Richard]

Found the book!

Gate Crashers