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Windows 11 Update Issues: Every Known Bug and Fix (2026)

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If your Windows 11 PC has been acting strange lately, you are not imagining it. The August and September 2026 updates introduced more bugs than usual, and Microsoft has been fixing them one at a time. This page tracks every confirmed issue, what caused it, whether it is fixed, and exactly what to do if you are affected.

Quick Answer​

  • Most bugs came from two updates: KB5120998 (August 27) and KB5124008 (September 8)
  • Most issues are already fixed through later...

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