After upgrading to macOS Tahoe 26.3, my M4 Pro Max (48GB RAM) began experiencing intermittent, simultaneous resets of all Thunderbolt-connected devices. During these events, external monitors briefly disconnect and reconnect, and USB peripherals (keyboard and mouse) reinitialize as if the Thunderbolt fabric renegotiated.
This was not occurring prior to the update.
All devices are directly connected (no dependency on a dock for display path). Cables are stable. The system does not reboot, and no IOThunderboltFamily or IOUSBHostFamily controller errors appear in unified logs during the events.
In short: the OS update introduced instability at the Thunderbolt/display layer.
When you purchase high-end Apple Silicon hardware specifically for reliability and professional workflow stability, you do not expect an OS update to intermittently reset all connected peripherals.
Until this regression is acknowledged and fixed, Tahoe 26.3 is not stable for Thunderbolt-heavy setups.
Claim your business profile now and gain access to all features and respond to customer reviews.
Apple designs and creates iPod and iTunes, Mac laptop and desktop computers, the OS X operating system, and the revolutionary iPhone.
