My book Live media crawler stops

Tanks for the answer.
I have tried both the reboot and the rebuild as described in the note.
For the reboot, the crawler starts and runs for 3-4 hours and scans some hundreds pictures. Then it stops again, and has to be rebooted again. If I have made changes to the already existing picture folders, this will not be found.
For the rebuild the crawler starts, but to scan all my pictures it has to be rebooted at least 10 times before all pictures are found. This process takes several days, and is not a satisfying procedure.
I thought that the crawler should start as soon as My Book Live is idle, and then scan until all changes (added or moved pictures) where found, or have I misunderstood something?
I will be very pleased if you can find a solution.