iPad photos sync forces iPad restart

:confused:I have 9,900 photos in iPhoto.
If I add some & resync from iTunes it optimizes then syncs - seems OK.
when I start photos on the iPad it says Please wait. Updating library...
This lasts a minute or two then the screen goes black.
If I leave it alone then in a minute or two it beeps and forces an iPad restart with the apple symbol along with the non spinning version of the busy symbol.
After the reboot - if I select photos this starts all over again.
If in iTunes I turn off photo syncing and delete all the photos from the iPad, then turn syncing back on again and resync the iPad everything works fine - but this loop takes FOREVER!
Rebuiding iPhoto database now...