aws lightsail need restart after every 24 hour for keep continious service of an application called outline or openvpn

I use a software called Outline to connect to a VPN on my phone and PC, utilizing my server on AWS Lightsail. However, after every 24 hours, my VPN stops working. I then have to go back to my Lightsail server, stop it, restart it, and reconfigure the process. After doing so, it works fine. At first, I thought the issue might be with the Outline VPN itself, so I tried a different application called OpenVPN, but the problem persisted. Then, I considered that since I live in China, the issue might be related to the IP address. To test this theory, I attempted using a static IP, but unfortunately, nothing seems to resolve the problem. Can you please provide guidance on how to solve this issue?