months ago I managed to solve my problem of bluetooth connection of the mobile phone to the system (RLINK 2 on KOLOES II). It is a solution that erases all the connections saved on your mobile phone (wifi, network, bluetooth) and starts from zero, so it is important to know all the passwords and parameters to be re-inserted after deletion.
I hope it helps..
Reset mobile phone Network Settings: on own mobile phone, go to Settings> General > Reset > Reset Network Settings.
This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you’ve used before.