Get Volvo Genuine Service included in your service plan when you purchase your Volvo outright.
Get your car serviced where it suits you, when you have purchased your Volvo outright.
You can replace the battery in your key tag when it goes flat. If however the battery goes flat within a short period of time, it may also need a software update by a Volvo dealer.
If the centre display's response is slow, it might help to restart the display. A restart may also fix the problem if you are experiencing issues with e.g. Bluetooth, navigation or connectivity.