Xbox has released a fix for a bug exposed by a recent service outage that stopped some users from playing disc-based games, despite physical copies normally being intended to work offline. The incident renewed concerns about game ownership and Xbox’s dependence on online systems, prompting the company’s technology chief to promise improved product reliability.

The outage affected sign-ins, game libraries and launches across multiple Xbox console generations, and lasted around 16 hours before service was restored at 2:30pm PDT. Xbox chief technology officer Scott Van Vliet said a fault had prevented some consoles from using saved entitlements during the outage; the new fix is intended to prevent a repeat, while he said the company would “do better” and improve reliability.