Xiaomi Mi Watch Dock 31064

I had to charge my Samsung watch daily, think lasts a week.

brought this watch for my brother in law after he lost his in Martinique and he loves it.

I have bought it only 20 days ago and the home button isn't working anymore.

I never got to manage properly how to connect it to my phone to read the texts. In my opinion it is a bit outdated. Battery life is great though. More than 10 days easily.

It seems to have issue syncing with the mobile apps from time to time. I had to reset the watch to reconnect with the apps. Lost my data a few instances sure to the reset process. It is now a little after 6 months and the watch won't connect with the phone apps anymore. It is also not recording sleep data. Where can I seek for the warranty please?