Fenix 5 and Xiaomi Mi8 pro

Good morning everyone, I have the phone in question for about a week and I associated the Fenix on the phone. Fenix, telephone and Garmin connect are updated to the latest software release.
The problem is that the Fenix after some time disconnects from the phone making the smart notification unusable. I have to reopen garmin connect every time, wait for it to reconnect and so it goes back to working all but for a limited period. Before this phone I had an LGG6 that has never given me these problems. In application settings Garmin Connect has all permissions and is excluded from any battery saving option.
Do you have any suggestions to remedy this?
Thank you