We recently addressed issues affecting Box Notes in Box. We would like to take the opportunity to further explain these issues and the steps we have taken to keep them from happening in the future.

On September 28, 2026, beginning at 2:35 AM PDT, during a routine maintenance operation, some Box Notes users who had the app open in a background browser tab may have seen a brief "Reconnecting" message and a short delay when they returned to the tab. No data was lost, users who were actively editing were not prevented from working, and we received no widespread customer reports.

The cause was a recent change to how Box Notes reconnects background tabs. We have since fixed the reconnection behavior and verified the fix.

Analysis

The cause was a recent change to how Box Notes reconnects browser tabs that are open in the background. After an infrastructure switch during a release, those tabs did not reconnect on their own and instead reconnected when customers returned to them. The release and infrastructure switch completed successfully, and background tabs reconnected gradually as customers came back to them. Normal connection levels returned by 3:33 AM PDT.

Corrective Actions

Box has initiated the following corrective actions:

• Fixing the reconnection behavior for background tabs so they reconnect automatically after an infrastructure switch, and verifying the fix with a controlled switch.
• Adding an automated test that reproduces this scenario, to catch any regression before release in the future.
• Scheduling a further review of reconnection logic with the team, paired with metrics analysis.

‌

We are continuously working to improve Box and want to make sure we are delivering the best product and user experience we can. We hope we have provided some clarity here and we would be happy to answer any questions you may still have regarding this matter.

Sincerely,
The Box Team