A couple ideas spring to mind, but don't play into the AI side of things.
MUSCLED OUT:
An other Fixer wants to take over the AIs network of contacts and runners. But to do that, he needs said info from the AI. An other tean has been hired to capture and return...
TOO HOT TO HANDLE:
The AI as a fixer has come into possession of a datapacket that has something too serious, embarassing, or valuable for the original owner to just let go, and has had the AI taken..
Theres a couple to get the juices going :p