all has to do with your server mysql setup
MySQL :: MySQL 5.0 Reference Manual :: B.1.2.9 MySQL server has gone away
whats the timeout etc. Remember the query your referencing is a delayed query. You can choose to turn off the views cache and we will normally update the photos tables view should also solve your problem.
The long and short of it is mysql is shutting down or timing out that process do to its server configuration.