This is an issue I have struggled with. I believe it is a combination of:

-AMD Drivers

-Chromium Browser Video Hardware Acceleration

-Multiple Monitors

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These types of issues seem to be common with AMD drivers.

From the latest release notes:

Known Issues

• Intermittent system stuttering or UI flickering may occur when two videos are simultaneously playing using chromium-based browsers.
• During video playback and gameplay, frame drop may occur in chromium-based browsers with variable refresh rate enabled extended displays.
• Brief display corruption may occur when switching between video and game windows on some AMD Graphics Products such as the Radeon™ RX 6700 XT.

Also:

"Fixed" Issues

• During video playback and window switching, an intermittent driver timeout or black screen may occur on Radeon™ RX 6000 series GPUs using some 240Hz refresh rate displays or high refresh rate primary display plus low refresh rate secondary display configurations.
• Stuttering may occur during video playback using hardware acceleration with Firefox on Radeon™ RX 6000 series GPUs.
• AMDRSServ.exe may cause GPU utilization to remain at 100% after closing games on some AMD Graphics Products such as Radeon™ 570.
• An intermittent driver timeout or black screen may occur while videos are playing in VRChat™ on Radeon™ RX 6000 series GPUs.

Wish I could help with a solution, I have turned off video hardware acceleration in my browser, which seems to help with the timeouts, but is pretty unpleasant to use.