Players affected will be able to resume playing after installing the update.
GTA 5 sells 386,000 copies in its first week.
The first ever simultaneous global launch for the franchise.
Saving in the outskirts of Lumiose City said to render the game unplayable.
FIFA 14 drops to No.2, with Pokemon X & Y new at No.3 and No.4.
Work on unannounced title began at The Pokemon Company this summer, report claims.
It's been a long time since Pokémon has been this good.
But digital version is available cheaper elsewhere.
Our review copies turned up too late for us to give our final verdict on time. Instead, here are impressions of the first ten hours of Pokemon Y.
Includes the debut of Pokémon the Movie: Genesect and the Legend Awakened.
Will release ahead of the retail games on October 12.