i have vivid ROM (from december) and the last vivid launcher updates...I can connect wired and wirelessly well my Android phone (Galaxy S10plus) to the unit.
You guys are having an odd behavior and are giving very low detail of the problem. i am not technician, but i think is is very difficult to find a solution whan the issue is "my unit connected before and now not"....so....if it was working before....it should be working. Zlink sure they test ther versions prior to be relesed. Dasaita tries the software as well with different devices.....so...it oculd be related to many possible causes:
* Change of phone firmware version....overall with Apple devices
* Some app that is interfering into the connection
*updates on the Android auto app on the phone...
I recommned to update your Units to the latest version of software available and then try to find the connection error from the same "base" version. If you go to update the firmware, i stroghly recommend to wipe data and start from fresh ROM
personally i think it is related to some corrupted connection data that stores the zlink app...i would remove the cache from Zlink app first, unpair the devices, forget all the connections to start over the connection again. Check the Android Auto app if you need to give specific permissions.
Zlink is an external app driven by an external company...for which specific hardware requirements and specific license is acquired by dasaita. Dasaita can ask for enhancements or bug repairs to zlink team, but first is needed to find the root cause.