I have deployed a native Android app built in Kotlin and Retrofit to the Play Store, currently used by over 200k users. While the majority of users are experiencing no issues and the app works fine, I've received reports from some users indicating that API requests fail when using both WiFi and mobile data connections.
These users have confirmed having a stable internet connection, and the backend server, which is a Spring Boot application deployed on AWS, boasts high availability. However, the API requests from the affected users consistently fail.
I'm struggling to pinpoint the root cause of this issue. Could it be related to specific network configurations, device-specific settings, or any other factors that might affect API requests? I'd appreciate any insights, suggestions, or troubleshooting steps to identify and resolve this issue.
Network Diagnostics: Our Android team have thoroughly checked and verified both the debug and release APK builds that they are making successful API requests and majority of the users have never complained about such an issue, this can also be verified through user Actions tracking by Amplitude.
Backend Server Status: Verified the status of the backend server (Spring Boot application on AWS) to ensure high availability and responsiveness.