Why Does the Roadtrip Always Connect to My Phone When I Arrive Home?

It is because the Roadtrip and your phone are still within effective operation range (10 meters). As a result, it is still connected to your phone and will not auto power off. Even if it is disconnected for a while, the speakerphone may reconnect with the phone if it detects motion within operating range. 

Solutions

1. Turn Bluetooth off on your phone.
2. Completely turn off the car kit by sliding the "OFF/ON/FM" switch into the "OFF" position.
   
   Note: When sets to "OFF" position, the Roadtrip is turned off. Next time you need to use it, you need to manually turn it on by sliding it to "ON"/"FM".