Your YouTube flashing black screen issue can stem from several common causes. It often results from unstable or weak internet connections causing video buffering problems where audio plays but the video screen flashes black. Other likely causes include browser issues such as outdated browsers, corrupted cache or cookies, or problematic browser extensions (like ad blockers) disrupting video playback. Hardware acceleration conflicts or outdated/faulty graphics drivers can also cause video flickering and black screens on YouTube. Additionally, system resource shortages or software interference, including antivirus or VPNs, may contribute. To fix this, try these steps:

• Check and stabilize your internet connection.
• Clear your browser cache and cookies.
• Disable browser extensions temporarily to isolate the culprit.
• Update or roll back your graphics drivers.
• Turn off hardware acceleration in your browser settings.
• Try using a different web browser.
• Restart your device.

Implementing these can resolve most YouTube black screen and flashing problems during video playback.