Microsoft has released Windows 11 Insider Release Preview Build 26100.8521 to address two significant regressions affecting daily usability on 24H2 and 25H2 systems. This update fixes an issue where audio randomly mutes itself after sleep or driver updates, as well as a frozen push notification service that prevents apps from launching. The availability of the update may vary based on whether a device is part of a gradual rollout or a normal release phase, so users should check Windows Update for the patch. Installing this update is advised for testers to ensure a stable experience while using the preview builds

Windows 11 Insider Release Preview Build 26100.8521 26200.8521 released

Microsoft has pushed Windows 11 Insider Release Preview Build 26100.8521 to fix two annoying regressions that break daily use on both 24H2 and 25H2 systems. The patch resolves a glitch where audio randomly mutes itself after sleep or driver updates, alongside a frozen push notification service that stops apps from launching entirely. Availability depends on whether your machine lands in Microsoft's gradual rollout wave or the broader normal release phase, so checking Windows Update might take a day or two. Installing this update clears out those specific hiccups and keeps the preview build stable enough for actual testing instead of constant troubleshooting.

Windows 11 Insider Release Preview Build 26100.8521 26200.8521 released @ NT Compatible