I have dealt with the League of Legends reconnect bug many times.
Here are the proven fixes that solved the problem.
- Repair Game Files: Click the gear icon in League client. Select Initiate Full Repair under General tab. Click Yes. Wait for repair to finish.
- Run as Administrator: Right-click League of Legends. Click Properties. Select Compatibility tab. Check Run as administrator. Click Apply.
- Update Network Drivers: Open Device Manager. Expand Network adapters. Right-click your network card. Select Update driver. Choose Search automatically. Install updates.
- Change DNS Settings: Open Command Prompt as admin. Type ipconfig /flushdns and press Enter. Open Network settings. Select network adapter. Set DNS to 8.8.8.8 (Google DNS).
- Check Windows Updates: Install pending updates.
- Remove Citrix if installed, it often conflicts with League.
- Extra Fixes: Close League client completely. End all League processes in Task Manager. Restart your PC. Launch League again.
These solutions help fix reconnect bug League of Legends. Start with the first fix and move down the list.
I found the repair and administrator fixes solve most cases. If issues continue, contact League support.