Google.com Randomly Unreachable Due to QUIC Protocol Timeouts in Specific Profile

Brave Browser Web Compatibility
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Description of the issue:

I’m experiencing intermittent connectivity issues with google[dot]com in one specific Brave profile, while all other Google services and websites work normally. The problem manifests as follows:

Symptoms:

  • Random “This site can’t be reached” errors when accessing google[dot]com or https://www.google[dot]com/
  • Search results page (generated from URL bar searches) also fails to load
  • Issue occurs randomly during browsing sessions - google[dot]com works initially but stops working after some time
  • Temporary fix: Closing and reopening the browser restores access until the issue randomly reoccurs

What Works Normally:

  • Other Google services (YouTube, Gmail, Google Drive) function perfectly in the same profile
  • google[dot]com works fine in other Brave profiles on the same machine
  • google[dot]com works fine in incognito mode
  • google[dot]com works fine in other browsers (Chrome, etc.)
  • All other websites work normally in the affected profile

Environment:

  • Same machine, same network, no proxy or VPN
  • Two Brave profiles with different Google accounts signed in
  • Only one profile is affected by this issue

Troubleshooting Steps Attempted:

  • Cleared DNS cache via brave://net-internals/#dns
  • Cleared browser cache and stored data
  • Tested with Shields disabled (issue persists)
  • Issue is NOT Shields-related

Network logs(brave://net-internals/#events) captured during the issue show QUIC protocol timeout errors:

{"params":{"details":"No recent network activity after 29001781us. Timeout:29s","from_peer":false,"quic_error":25},"phase":0,"source":{"id":3299,"start_time":"18992303","type":12},"time":"19021398","type":356}

The logs show requests to google[dot]com failing with net_error":-1 and quic_error":25 (network timeout), while other Google services continue working normally.

At the moment disabling QUIC protocol (brave://flags/#enable-quic set to “Disabled”) seems to solve the issue but I need to check further.

Exact URL of the website in question: https://www.google.com and https://google.com

Did the issue present with default Shields settings? yes

Does the site function as expected when Shields are turned off? No

Is there a specific Shields configuration that causes the site to break? If so, tell us that configuration. (yes/no): NA

Does the site work as expected when using Chrome? Yes

Brave version (check About Brave): Brave 1.82.170

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