My Xiaomi (MIUI) kills the Kurviger app

Xiaomi introduced battery optimization technique that can stop apps in the background. If the Kurviger app suddenly stops on your Xiaomi, then it was probably killed to save battery. Luckily it's possible to disable this setting. Every phone and Android version is a bit different, here is what helped some Kurviger users. Go to Settings, Battery and performance, Manage apps battery usage → Off.