The message "wlan0: DHCP lease expired" in the system journal suggests that your Raspberry Pi is experiencing issues with its wireless network connection. While this message alone may not be the sole cause of your connection problems, it's a clue that something might be amiss.

Here are some steps you can take to diagnose and potentially resolve the issue:

1. **Check Wi-Fi Signal Strength:** Weak or intermittent Wi-Fi signals can lead to DHCP lease expirations. Ensure that your Raspberry Pi has a strong and stable Wi-Fi signal. You can move the Pi closer to the router or use Wi-Fi signal boosting devices if necessary.

2. **Inspect DHCP Configuration:** DHCP lease expirations can occur if there are conflicts or issues with your DHCP server (usually your router). Check your router's DHCP settings to ensure that it's configured correctly. Make sure it has enough available IP addresses in the DHCP pool.

3. **Static IP Configuration:** Consider assigning a static IP address to your Raspberry Pi instead of relying on DHCP. This can eliminate lease expiration issues. To do this, you'll need to configure a static IP address in your Raspberry Pi's network settings.

4. **Network Troubleshooting:** Use network troubleshooting commands to gather more information. Open a terminal on your Raspberry Pi (if possible) or through physical access, and try the following commands:
   
   - Check network interfaces: `ifconfig` or `ip a`
   - Check Wi-Fi signal strength: `iwconfig`
   - View DHCP lease information: `cat /var/lib/dhcp/dhclient.leases`

5. **Reconnect SSH:** If your SSH connection drops due to network issues, you may need to reconnect. Ensure that you're using the correct IP address for your Raspberry Pi, especially if you've assigned a static IP.

6. **Check for Software Conflicts:** Sometimes, software conflicts or high system loads can affect network stability. Check your Raspberry Pi's resource usage (CPU and memory) using tools like `top` or `htop`.

7. **Update and Reboot:** Ensure that your Raspberry Pi's operating system and packages are up to date. Run `sudo apt update` and `sudo apt upgrade` to update your system. After updating, it's a good practice to reboot your Pi.

8. **Logs and Error Messages:** Review the system logs (`/var/log/syslog`) for any error messages or clues related to network issues. These logs may provide more specific information about the problem.

9. **Consider a Wired Connection:** If possible, consider using a wired Ethernet connection instead of Wi-Fi. Wired connections tend to be more stable and reliable.

10. **External Factors:** Be aware of external factors like power interruptions or overheating, which can lead to Raspberry Pi instability.

By following these steps, you can diagnose and potentially resolve the issue causing your Raspberry Pi to lose its network connection. Pay close attention to the logs and error messages for additional insights into the problem.
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