1) Confirm the basics
- Refresh the page.
- Start a new conversation.
- Sign out/in.
2) Try a private window
If it works in private mode, the issue is usually:
- cache/cookies
- an extension
3) Disable extensions
Especially:
- ad blockers
- anti‑tracking tools
- web antivirus/security extensions
4) Network/VPN/proxy
- Temporarily disable VPN/proxy.
- Switch networks (Wi‑Fi ↔ 4G/5G).
- Corporate networks may block traffic via firewall.
5) If it persists
Record time, error message, and browser/device, and try again later (it may be temporary instability).