This has been an issue since the latest update. I have it too, iOS 16.7 and Y168 on the radio.
What I do is:
Hit the phone icon on the head unit, usually shows
My phone connected
Hit manage phones
Hit my phone
Hit Disconnect
Wait for a bit, CarPlay icon appears in phone icon on head unit
Tap that icon
Usually Reconnects
Hope this gets fixed in a recent update
No luck with that, but here is what (finally) did work...
-- I updated my iPhone OS to 17.0.3. That is the absolute latest version of the iOS.
-- then went to Settings --> System --> Reset Options --> Erase Infotainment Data
-- after doing this, I was able to reconnect my phone
Originally, it was not allowing me to disconnect my phone, yet it couldn't connect my phone either.
Thanks for your suggestion. It set me onto the right path!