To maintain a stable connection between the Redmi Watch 5 Active and the Mi Fitness APP, it is essential to ensure that the APP remains active in the background. You can achieve this by enabling keep-alive/auto-start/turn off the power limit for the APP. Additionally, locking the APP in the background can further improve its ability to stay active.
For Android devices, you can adjust these settings by opening the Mi Fitness APP, navigating to the [Device] page, and selecting [Background permissions]. The exact path can vary depending on your phone model, so you need to explore your device's settings if you encounter any differences.