[BUG] Frequent session freezes / connection drops on Claude Code (VS Code extension) under

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Title: Frequent session freezes / connection drops on Claude Code (VS Code extension) under WSL2

Versions

• Claude Code CLI: 2.1.150
• Surface: VS Code native extension (vscode-server / WSL remote)
• Model: Opus 4.8 (1M context) — claude-opus-4-8[1m]
• Node: v22.18.0
• npm: 10.9.3
• Bun: bundled inside the CLI (not on PATH)
• WSL: 2.7.3.0
• WSL kernel: 6.6.114.1-microsoft-standard-WSL2 (x86_64)
• WSLg: 1.0.73 | MSRDC: 1.2.6676 | Direct3D: 1.611.1-81528511
• Distro: Ubuntu 22.04.5 LTS
• Windows: 10.0.26200.7840
• WSL networking: NAT mode (mirrored mode is NOT usable — see notes)

Summary

Sessions freeze / hang very frequently during normal use. The UI appears to
stall mid-turn, and in some cases the underlying connection drops with a
"socket closed" type error. This happens multiple times within a single
working session, sometimes seconds apart, badly disrupting the workflow.

Frequency

Very high — repeated stalls within the same session, multiple times per hour.

Suspected cause

Appears related to the keepalive / socket handling of the underlying runtime
(Bun) when running through the WSL2 networking stack. Long-lived connections
seem to drop unexpectedly.

Expected behavior

Sessions should stay responsive and connections stable across a normal
working session in WSL2, without repeated freezes or dropped sockets.

Actual behavior

The session freezes repeatedly; work is interrupted and has to be resumed,
sometimes losing the in-progress turn.

Notes / mitigations tried

• WSL "mirrored" networking mode is NOT a viable workaround: enabling it

broke the WSL environment entirely, so it had to be reverted. Please do not
suggest mirrored mode as a fix.

• Tuning keepalive-related environment variables in ~/.claude/settings.json

was attempted as a mitigation, with limited effect.

Impact

Severe day-to-day productivity impact. Requesting prioritization for WSL2
stability.

What Should Happen?

Title: Frequent session freezes / connection drops on Claude Code (VS Code extension) under WSL2

Versions

• Claude Code CLI: 2.1.150
• Surface: VS Code native extension (vscode-server / WSL remote)
• Model: Opus 4.8 (1M context) — claude-opus-4-8[1m]
• Node: v22.18.0
• npm: 10.9.3
• Bun: bundled inside the CLI (not on PATH)
• WSL: 2.7.3.0
• WSL kernel: 6.6.114.1-microsoft-standard-WSL2 (x86_64)
• WSLg: 1.0.73 | MSRDC: 1.2.6676 | Direct3D: 1.611.1-81528511
• Distro: Ubuntu 22.04.5 LTS
• Windows: 10.0.26200.7840
• WSL networking: NAT mode (mirrored mode is NOT usable — see notes)

Summary

Sessions freeze / hang very frequently during normal use. The UI appears to
stall mid-turn, and in some cases the underlying connection drops with a
"socket closed" type error. This happens multiple times within a single
working session, sometimes seconds apart, badly disrupting the workflow.

Frequency

Very high — repeated stalls within the same session, multiple times per hour.

Suspected cause

Appears related to the keepalive / socket handling of the underlying runtime
(Bun) when running through the WSL2 networking stack. Long-lived connections
seem to drop unexpectedly.

Expected behavior

Sessions should stay responsive and connections stable across a normal
working session in WSL2, without repeated freezes or dropped sockets.

Actual behavior

The session freezes repeatedly; work is interrupted and has to be resumed,
sometimes losing the in-progress turn.

Notes / mitigations tried

• WSL "mirrored" networking mode is NOT a viable workaround: enabling it

broke the WSL environment entirely, so it had to be reverted. Please do not
suggest mirrored mode as a fix.

• Tuning keepalive-related environment variables in ~/.claude/settings.json

was attempted as a mitigation, with limited effect.

Impact

Severe day-to-day productivity impact. Requesting prioritization for WSL2
stability.

Error Messages/Logs

Steps to Reproduce

Just try to use Claude for 2 minutes!!!!!

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.150 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

WSL (Windows Subsystem for Linux)

Additional Information

_No response_